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Full text of "Floods in central Texas, August 1978"

Floods in Central Texas, August 1978 



U.S. GEOLOGICAL SURVEY 

Open-File Report 79-682 




.32 
1*28 
24 



* 




^ RA IN FALL -j_ 




Prepared in cooperation with the State of Texas and 
other agencies 



Cover photograph, Brazos River in flood at Graham, 
by Randy Black, Dallas, Texas. 



Floods in Central Texas, August 1978 



By E.E. Schroeder, B.C. Massey, and Kidd M. Waddell 

U.S. GEOLOGICAL SURVEY 

Open-File Report 79-682 




Prepared in cooperation with the State of Texas and 
other agencies 



April 1979 



Reproduced by the Texas Department of Water Resources 
as part of the continuing program of cooperation in 
water-resources investigations between the Department 
of Water Resources and the U.S. Geological Survey. 






Copies of this report may be obtained from the 

U.S. Geological Survey 

Federal Building 

300 East 8th Street 

Austin, TX 78701 



CONTENTS 



Page 



Abstract 1 

Int r oduc t i on 2 

Purpose and scope of this report 2 

Definitions of terms and abbreviations 2 

Metric conversions 3 

Description of the storm 3 

Description of the floods 4 

Nueces River basin 4 

Guadalupe River basin 4 

Medina River basin 6 

Colorado River basin 11 

Pedernales River 11 

Llano River 11 

Brazos River basin 11 

Magnitude and frequency of the floods 12 

Flood damage 14 

Water-quality changes in the Brazos River basin 18 

Water-level changes in the Edwards aquifer 26 

Selected references 29 



in 



ILLUSTRATIONS 

Page 

Figure 1. Map showing locations of streamf low-data sites 5 

2. Discharge hydrographs for Guadalupe River at 

Comfort and Guadalupe River near Spring Branch 7 

3. Log Pearson type III frequency curve for Medina 

River near Pipe Creek 8 

4. Photograph showing cypress tree uprooted by 

floodwaters on the Medina River 9 

5. Photographs showing Medina River near Pipe Creek, 

before, during, and after the flood 10 

6. Discharge hydrographs for Hubbard Creek below 

Albany and Hubbard Creek near Breckenridge 13 

7. Photograph showing inundation of State Highway 

173 and the Medina River bridge at Bandera 15 

8. Photograph showing State Highway 290 flooded by 

Spring Creek near Fredericksburg 16 

9. Photograph showing aerial view of the Brazos River 

in flood at Graham 17 

10. Map showing locations of water-quality data- 

collection sites on Hubbard Creek Reservoir 19 

11. Map showing locations of water-quality data- 

collection sites on Possum Kingdom Reservoir 20 

12. Map showing locations of water-quality data- 

collection sites on Whitney Lake 21 

13. Map showing locations of water-quality data- 

collection sites on the Brazos River 22 

14. Profiles of specific conductance and density for 

Hubbard Creek Reservoir during June and August 

1978 23 

15. Profiles of specific conductance and density for 

Possum Kingdom Reservoir during June and August 

1978 24 

16. Profiles of specific conductance and density for 

Whitney Lake during June and September 1978 25 

17. Graphs showing daily specific conductance and 

instantaneous discharge for five sites on the 

Brazos River downstream from Whitney Lake, July 

and August 1978 27 

18. Water-level changes in wells in the Edwards 

aquifer, July 10-August 25, 1978 28 



IV 



TABLES 

Page 

Table 1. Summary of flood stages and discharges 30 

2. Locations of discontinued stream-gaging stations 

and miscellaneous discharge-measurement sites 35 

3. Water-quality data for Hubbard Creek, June 9 and 

August 29, 1978 36 

4. Water-quality data for Possum Kingdom Reservoir, 

June 13 and August 30, 1978 38 

5. Water-quality data for Whitney Lake, June 23 and 

September 5-6, 1978 40 

6. Station descriptions and discharge data 42 



Digitized by the Internet Archive 

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A'* DATA -COLLECTION SITE! Number 
corresponds to t ho t in toble I and in 
the report tent 

103 COUNTIES DESIGNATED AS FLOOD- 
DISASTER AREAS 

BASIN DIVIDE 



60 80 



FIGURE 1.. Locations ol streamHow-data 



FLOODS IN CENTRAL TEXAS 
AUGUST 1978 

By 

E. E. Schroeder, B. C. Massey 
and Kidd M. Waddell 



ABSTRACT 

Catastrophic floods, which resulted in millions of dollars in prop- 
erty damages and the loss of 33 lives, occurred in Central Texas during 
August 1-4, 1978, as a result of intense rainfall produced by the remnants 
of tropical storm Amelia. Rainfall in excess of 30 inches was unofficially 
reported at several locations, while the highest 24-hour amount recorded 
by the National Weather Service was 29.05 inches at Albany in Shackelford 
County. 

Major flooding occurred on the Medina River and tributaries above 
Medina Lake and on the Guadalupe River and tributaries above Canyon Lake. 
Minor to severe flooding occurred on the tributaries of the Nueces River, 
on the Clear Fork Brazos River and tributaries, and on the Llano and Peder- 
nales Rivers, which are tributaries of the Colorado River. 

Peak discharges at several streamflow stations exceeded the historic 
peaks, and the flood magnitude and frequency data for the Guadalupe River 
above Canyon Lake, the Medina River near Pipe Creek, and Clear Fork Brazos 
River indicate that the August 1978 flood had a recurrence interval in 
excess of 100 years. The highest unit discharge observed during this flood 
was 3,010 cubic feet per second from a 14 .1-square-mile drainage area of 
Spring Creek, which is tributary to the Pedernales River. 



INTRODUCTION 
Purpose and Scope of This Repor t 

The purpose of this report, which was prepared in cooperation with 
the State of Texas and other agencies, is to present the available flood 
data in a form that should be of value in assessing the risks involved in 
developing the flood plains of streams that are subject to chronic flood- 
ing. The report presents a description of the storm, a description of the 
flood by basins, peak stages and discharges, discharge-hydrograrih data, 
flood-frequency estimates, damage estimates, a discussion of the changes 
in water quality in selected streams and reservoirs in the Brazos River 
basin, and a discussion of water-level changes in observation wells in 
the Edwards aquifer. 

Definitions of Terms and Abbreviations 

Technical terms and abbreviations, as used in this report, are defined 
as follows: 

Gaging station is a particular site on a stream, canal, lake, or reservoir 
where systematic observations of gage height or discharge are obtained. 
When used in connection with a discharge record, the term is applied only 
to gaging stations where a continuous record of discharge is obtained. 
Crest-stage station is a particular site where limited streamflow data 
on peak stages are collected systematically over a period of years for 
use in hydrologic analyses. 

Cubic foot per second (ft 3 /s) is the rate of discharge representing a vol- 
ume of 1 cubic foot passing a given point during 1 second. This rate is 
equivalent to a 24-hour volume of 86,400 cubic feet, 1.983471 acre-feet, 
or 646,317 gallons. 

Cubic foot per second per square mile [ (ft 3 /s)/mi 2 ] is the average number 
of cubic feet of water flowing per second from each square mile of area 
drained, assuming that the runoff is distributed uniformly in time and area 
Acre-foot is the quantity of water required to cover 1 acre to a depth 
of 1 foot and is equivalent to 43,560 cubic feet, or 325,851 gallons. The 
term is generally used in relation to storage and volume of runoff. 
Runoff , in inches, is the depth to which a drainage area would be covered 
if all the runoff for a given time period were uniformly distributed on 
its surface. 

Drainage area of a stream at a specified location is that area, measured 
in a horizontal plane, that is enclosed by a topographic divide so that 
direct surface runoff from precipitation normally would drain by gravity 
into the stream above the specified point. Drainage area is expressed in 
square miles. 

Contents is the volume of water in the reservoir or lake and is expressed 
in acre-feet. Volume is computed on the basis of a level pool and does 
not include bank storage. 

Time of day is expressed in 24-hour time; for example, 12:30 a.m. is 0030, 
1:30 p.m. is 1330. All times noted are Central daylight time. 
Specific conductance is a measure of the ability of water to conduct an 
electrical current and is expressed in micromhos per centimeter at 25°C. 
Because the specific conductance is related to the number and chemical 



-2- 



types of ions in solution, it can be used to determine the approximate 
concentration of dissolved solids in the water. Commonly, the concentra- 
tion of dissolved solids (in milligrams per liter) is about 65 percent 
of the specific conductance (in micromhos per centimeter at 25°C) . This 
relation is not constant from stream to stream, and it may vary in the 
same stream with changes in the composition of the water. 
pH of a solution is a measure of effective hydrogen-ion concentration and 
is expressed as the negative logarithm of the hydrogen-ion activity in 
moles per liter. The degree of acidity or alkalinity of water, as indi- 
cated by the pH, is related to the corrosive properties of water. A pH 
of 7.0 indicates that the water is neither acid or alkaline. pH readings 
progressively lower than 7.0 denote increasing acidity and those progres- 
sively higher than 7.0 denote increasing alkalinity. 

Dissolved oxygen (DO) content of water in equilibrium with air is a func- 
tion of atmospheric pressure, dissolved-solids content, and temperature of 
the water. The ability of water to retain oxygen decreases with increas- 
ing temperature or dissolved-solids concentration. Photosynthesis and 
respiration may cause diurnal variations in dissolved-oxygen content in 
water from streams. 

Metric Conversions 

The "inch-pound system" units used in this report may be converted 
to metric units by the following factors: 



From 




Multiply by 


To 


obtain 


Unit 


Abbrevi- 


Unit 




Abbrevi- 




ation 








ation 


acre-foot 


-- 


1,233 


cubic meter 




m 3 


cubic foot 


ft 3 


28.32 


liter 




-- 


cubic foot per 


ft 3 /s 


28.32 


liter per 




L/s 


second 






second 






cubic foot per 


(ft 3 /s)/mi 2 


.01093 


cubic meter 


per 


(m 3 /s)/km 2 


second per 






second per 






square mile 






square kilometer 




foot 


-- 


.3048 


meter 




m 


gallon 


-- 


3.785 


liter 




-- 


inch 


-- 


2.54 


centimeter 




cm 


square mile 


-- 


2.590 


square kilometer 


km 2 



DESCRIPTION OF THE STORM 



Tropical storm Amelia moved inland on the lower Texas coast during 
the early morning hours of Monday, July 31, 1978. The position of the 
poorly defined storm center was estimated at latitude 28.5°N and longitude 
97.8°W at 0800 hours Monday. At 1100 hours, the position of the center 



had moved one-half degree due north to 29.0°N. This was the last official 
position report issued. 

The remnants of the storm drifted westward and northward across Bexar 
County and the Edwards Escarpment into south-central Texas, where torren- 
tial rains occurred in Bandera, Kendall, and Kerr Counties. With its upper- 
level circulation apparently still intact, the storm system moved north- 
ward across the Pedernales, Llano, San Saba, and Colorado River basins, 
where some small areas received as much as 20 inches of rainfall. The 
storm continued to move northward into north-central Texas, where it stalled 
in the upper Brazos River basin and produced rainfall amounts that were 
comparable to the amounts that occurred earlier in south-central Texas. 
The magnitude of the storm in north-central Texas was greater than that 
of any previously recorded storm. 

A more complete description of the storm will be presented in reports 
being prepared by tie U.S. Geological Survey and the National Weather 
Service. 



DESCRIPTION OF THE FLOODS 

Flooding to some degree occurred in an area of approximately 25,000 
square miles in parts of the Nueces, Guadalupe, Colorado, and Brazos River 
basins. A summary of flood stages and discharges for selected sites is 
given in table 1; the locations of the sites are shown on figure 1. The 
locations of discontinued stream-gaging stations and miscellaneous discharge- 
measurement sites are given in table 2. Station descriptions and discharge 
data are given in table 6. 

Nueces River Basin 

During the early part of the storm on August 1, 1978, substantial 
rain fell on the headwaters of the Sabinal River, Hondo Creek, and Seco 
Creek in the Nueces River basin. The greatest 24-hour amount recorded 
by the National Weather Service in this basin was at Vanderpool in Bandera 
County, where a total of 11.53 inches fell in the 24-hour period ending 
at 0700 hours on August 2, 1978. Sharp rises occurred on many streams, 
but flooding was minor. 

Guadalupe River Basin 

The drainage area of the Guadalupe River above Canyon Lake received 
the first of the heavy rainfall during the night of August 1 and the morn- 
ing of August 2. The storm cell, which was centered just west of Kerrville 
in Kerr County, produced rainfall amounts that resulted in severe flooding 
on the Guadalupe River and all of its local tributaries. On August 2, the 
flood crest on the Guadalupe River at Comfort (map no. 75 on fig. 1) exceeded 
by 0.6 foot the previously known maximum, which occurred in July 1869. 
When the crest reached the Spring Branch gaging station (no. 76) on August 



3, the peak discharge had attenuated from 240,000 ft 3 /s at Comfort to 
158,000 ft 3 /s at Spring Branch (fig. 2). Secondary peaks occurred at 
both stations as a result of inflow from tributary streams. 

Canyon Lake contained all of the runoff from this flood, so no damage 
occurred below Canyon Lake. The contents of Canyon Lake increased from 
362,200 acre-feet at 2400 hours on August 1 to 588,400 acre-feet at 2400 
hours on August 4. This was the maximum storage since closure of the dam 
on July 21, 1962. 

Medina River Basin 

A second cell of the storm that caused flooding in the Guadalupe 
River basin was centered near Medina in Bandera County where the North 
Prong and the West Prong of the Medina River join. The unofficial total 
rainfall was in excess of 30 inches, which developed a catastrophic flood 
on the headwaters of the Medina River. A peak discharge of 123,000 ft 3 /s 
from a drainage area of 67.5 square miles was recorded at a miscellaneous 
site (no. 80) on the North Prong Medina River about 10 miles upstream from 
Medina. Field inspection after the flood indicated that the maximum flood 
peak occurred a short distance downstream from the confluence of the North 
Prong and West Prong of the Medina River. 

When the flood crest reached the stream-gaging station near Pipe 
Creek (no. 82) on August 2, it exceeded by more than 6 feet the previous- 
ly known maximum stage since 1880, which occurred in 1919. The peak dis- 
charge at the station near Pipe Creek was 281,000 ft 3 /s. A reanalysis of 
the annual peak-flow data for this site shows that a discharge of 281,000 
ft 3 /s has an apparent recurrence interval greatly in excess of 100 years 
(fig. 3). Red Bluff Creek (no. 83), which flows into the Medina River just 
below the Pipe Creek station, received very little runoff and had a peak 
discharge of only 160 ft 3 /s on August 2. 

Medina Lake near San Antonio (no. 84) reached a stage of 1,076.67 
feet, with 4 feet of flow over the spillway at the maximum stage. Storage 
in Medina Lake increased from 188,200 acre-feet at 0800 hours on August 
1 to 281,000 acre-feet at 1900 hours on August 2. 

One of the most striking indications of the severity of the flood 
was the destruction of the massive cypress trees that lined the low-water 
banks of the Guadalupe and Medina Rivers and many of the tributaries. 
These trees ranged in size up to 6 feet in diameter, and the larger trees 
were estimated to be as much as 600 years old (oral commun., David Riskin, 
Botanist, Texas Parks and Wildlife Department, September 1978). Entire 
stands of these picturesque trees were either uprooted or snapped off and 
floated downstream. Hundreds were left scattered along the flood plains 
(fig. 4) or lodged in huge piles of debris along the channel banks and 
beneath the highway bridges. Many of the trees that were not uprooted 
were left partially down and stripped of their bark and foliage (fig. 5). 



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EXCEEDANCE PROBABILITY, IN PERCENT 


400,000 




90 83 67 50 20 10 4 2 10.5 0.2 




1 I ll l I l l I l 








° Station data (1923-78) plotted as recommended 
by Water Resources Council (1977) guidelines 








(Bulletin I7A) 

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100,000 


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1.01 l.ll 1.5 2 5 10 25 50 200 1 


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RECURRENCE INTERVAL, IN YEARS 



FIGURE 3. -Log Pearson type III frequency curve for Medina River 
near Pipe Creek 




Figure 4. --Cypress tree uprooted by floodwaters on the Medina River 
(Photograph by Susan Yost, Medina, Tex.) 







Figure 5. -Medina River near Pipe Creek, before, during, and afte 



\r the flood 



In this area of Central Texas, older trees develop an extensive sys- 
tem of large lateral roots because tap roots cannot penetrate the lime- 
stone bedrock beneath the shallow topsoil . When the receeding floodwaters 
became too shallow to maintain free flotation of the uprooted trees, the 
lateral roots carved distinctive ruts in the soil as the trees were moved 
along the flood plain. In field investigations, these straight narrow 
ruts could be used as indicators of the direction of flow. 

Colorado River Basin 
Pedernales River 

Heavy rainfall was not as widespread in the Colorado River basin as 
in the Guadalupe and Medina River basins, but the highest unit runoff 
observed during this storm occurred on Spring Creek, which is tributary 
to the Pedernales River. Spring Creek, a short distance upstream from the 
station Spring Creek near Fredericksburg (no. 66), had a peak discharge 
of 42,500 ft 3 /s from a 14 . 1 -square-mile drainage area. The unit discharge 
was 3,010 ft 3 /s/mi 2 , which is equivalent to 4.67 inches of runoff per hour 
at the time of the peak. 

Overbank flooding occurred on the Pedernales River upstream from the 
gaging station near Johnson City (no. 68), but the flood crest was about 
17 feet lower than the crest of the September 1952 flood. 

Llano River 

Rainfall in the Llano River basin was generally 5 inches or less 
except in several small areas near Junction. The peak discharge on Bear 
Creek (no. 59), which is tributary to the North Llano River just north- 
west of Junction, was 81,000 ft 3 /s from a drainage area of 155 square 
miles. The floodwaters on Bear Creek inundated Interstate Highway 10, 
which was closed for several hours. 

Brazos River Basin 

As the storm moved northward into the Brazos River basin, the rainfall 
intensified. During the 24 -hour period ending at 0700 hours on August 4, 
1978, a total of 29.05 inches of rain was recorded by the National Weather 
Service at Albany in Shackelford County. Record-breaking floods occurred 
on the Clear Fork Brazos River and on Hubbard Creek and other tributaries 
of the Clear Fork Brazos River. A peak discharge of 103,000 ft 3 /s from a 
drainage area of 39.3 square miles was recorded at North Fork Hubbard Creek 
near Albany (no. 18) on August 4. The unit discharge of 2,621 ft 3 /s/mi 2 was 
one of the highest ever recorded in Texas for a drainage area of this size. 
The streamflow station Hubbard Creek below Albany (no. 19) had a peak dis- 
charge of 330,000 ft 3 /s from a drainage area of 613 square miles. 

The contents of Hubbard Creek Reservoir near Breckenridge (no. 21) 
increased from 185,800 acre -feet at 2400 hours on August 2 to a maximum 
of 401,500 acre-feet at 0800 hours on August 5. The reservoir effectively 
contained the floodwaters from the Hubbard Creek basin although it was not 



•11 



designed for flood control. Sufficient storage capacity was available in 
the reservoir to contain the flood wave with only moderate releases, which 
prevented more serious flooding downstream on the Clear Fork Brazos River. 
The streamflow station Hubbard Creek near Breckenridge (no. 22), downstream 
from the reservoir and about 11 miles upstream from the Clear Fork Brazos 
River, had a peak discharge of only 14,600 ft 3 /s (fig- 6). 

Serious flooding developed on the Clear Fork Brazos River as a result 
of heavy runoff from tributaries upstream from Hubbard Creek. California 
Creek near Stamford (no. 14), which has a drainage area of 478 square 
miles, had a peak discharge of 40,000 ft 3 /s. The streamflow station on 
the Clear Fork Brazos River at Fort Griffin (no. 16) recorded a peak dis- 
charge of 149,000 ft 3 /s, and the stage exceeded the previously known maxi- 
mum stage by 0.88 foot. When the flood crest reached the gaging station 
at Eliasville (no. 23), 13.2 miles upstream from the main stem of the Brazos 
River, the peak discharge had attenuated to 68,000 ft 3 /s. 

The streamflow station on the Brazos River near South Bend (no. 24), 
1.8 miles downstream from the Clear Fork Brazos River, had a peak discharge 
of 78,100 ft 3 /s. Although this discharge was exceeded by a flood that 
occurred in May 1941, the peak stage (41.5 feet) was the greatest to 
occur since at least 1876. Because of changes in the stage-discharge 
relationship, the peak stage of the August 1978 flood exceeded that of 
May 1941 by about 14 feet. 

Major flooding occurred along the Brazos River from South Bend to 
Possum Kingdom Reservoir. Possum Kingdom Reservoir was 6.6 feet below 
the normal pool level, and releases from the reservoir by the Brazos 
River Authority, in anticipation of the approaching flood wave, reduced 
the crest of the flood and effectively prevented a more serious flood 
from occurring downstream. Flood damages in the Brazos River basin down- 
stream from Possum Kingdom Reservoir were minimal, and no flooding occurred 
on the Brazos River downstream from Lake Whitney, where sufficient stor- 
age capacity was available to contain the floodwaters. 



MAGNITUDE AND FREQUENCY OF THE FLOODS 

The relation of flood-peak magnitude to the proabability of occurrence, 
or recurrence interval, is generally referred to as a flood-frequency 
relation. The probability of occurrence is the percent chance of a given 
flood magnitude being exceeded in any 1 year. The recurrence interval, 
which is the reciprocal of the probability of occurrence multiplied by 
100, is the average number of years between exceedances. It is emphasized 
that the recurrence interval is an average interval and that the occur- 
rence of floods is assumed to be random in time; no schedule of regularity 
is implied. The occurrence of a flood having a 50-year recurrence inter- 
val (2-percent chance of occurrence) is no guarantee, therefore, that a 
flood of equal or greater magnitude will not occur the following year, or 
even the following week. 



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Discharge computations show that the Clear Fork Brazos River, the 
Guadalupe River above Canyon Lake, and the Medina River above Medina Lake 
all had peak discharges in excess of the 100-year recurrence interval. 
The peak discharge for Spring Creek near Fredericksburg (no. 66) was 3.8 
times the magnitude of the 100-year regional flood. Flood-frequency data 
are indicated in table 1 for all stations in the flood area that experi- 
enced floods with frequencies of 10 years or more. 



FLOOD DAMAGE 

Seventeen counties in Central Texas sustained widespread damages 
from the floods associated with tropical storm Amelia (National Oceanic 
and Atmospheric Administration, 1978). Eight of these counties (Bandera, 
Kendall, and Kerr Counties in south-central Texas, and Haskell, Shackel- 
ford, Stephens, Throckmorton, and Young Counties in north-central Texas) 
were declared flood-disaster areas by the Federal government. Ironically, 
Bandera, Kendall, and Kerr Counties had been declared drought-disaster 
areas prior to the floods. 

In Bandera, Kendall, and Kerr Counties, 25 people were drowned, about 
150 people were injured, and property damages were estimated to be at 
least 50 million dollars. About 175 homes were destroyed and about 650 
were damaged. About 350 businesses were destroyed or damaged. Public 
utilities were disrupted in much of the area and many roadways and bridges 
were heavily damaged. The bridge on State Highway 173 over the Medina 
River at Bandera, which was designed to withstand the 50-year flood, was 
inundated by 18 feet of water (fig. 7). The damage to livestock and crops, 
to farm and ranch facilities, and to farm and pasture lands was extremely 
heavy. 

A considerable amount of damage was also sustained in Gillespie and 
Kimble Counties in south-central Texas. Two people were drowned when 
Spring Creek inundated the bridge on State Highway 290 west of Fredericks- 
burg (fig. 8), and many roadways, bridges, and farm and ranch lands were 
extensively damaged. 

In Haskell, Shackelford, Stephens, Throckmorton, and Young Counties 
in the Brazos River basin in north-central Texas, the flood damage was 
comparable to the damage in south-central Texas. Six people were drowned, 
four were injured, and property damages were estimated to be at least 62 
million dollars. About 750 homes and 75 businesses were destroyed or 
damaged (fig. 9), and the damages to livestock, crops, and farm and ranch 
lands were extremely severe. In Haskell County alone, these damages were 
estimated to be about 30 million dollars. 

In the total area affected by the storm, 33 people were drowned, 154 
were injured, and property damages were estimated to be more than 110 mil- 
lion dollars. The devastation resulting from tropical storm Amelia and 
the subsequent floods exceeded that of any storm in Central Texas in recent 
history. 



■14- 







Figure 7.— Inundation of State Highway 173 and the Medina River bridge at 
Bandera 
(Photograph by the Bandera, Tex., Bulletin) 




Figure 8. --State Highway 290 flooded by Spring Creek near Fredericksburg 
(Photograph by the Fredericksburg, Tex., Standard) 



. 



-*^£ 




I 




'II 




4! 






^ "*-WBs 



i 



<? 




Figure 9. --Aerial view of the Brazos River in flood at Graham 
(Photograph by Randy Black, Dallas, Tex.) 



WATER-QUALITY CHANGES IN THE BRAZOS RIVER BASIN 

The large volume of runoff associated with the floods in the drain- 
age area of the upper Brazos River had a considerable effect on the water 
quality of the streams and reservoirs. Selected water-quality data from 
sites on Hubbard Creek Reservoir (fig. 10), Possum Kingdom Reservoir (fig. 
11), and Whitney Lake (fig. 12) and from five sites on the Brazos River 
downstream from Whitney Lake (fig. 13) were compiled to show the water- 
quality conditions before and after the storm. 

The data used to represent water-quality conditions in the reservoirs 
prior to the flood were collected during June 9-23, 1978, and the data used 
to represent conditions after the floods were collected during August 29- 
September 6, 1978. The water-quality data for the reservoirs are given in 
tables 3-5. 

Profiles of specific conductance and density for Hubbard Creek Reser- 
voir, Possum Kingdom Reservoir, and Whitney Lake are shown on figures 14, 
15, and 16, respectively. These profiles, which show the water-quality 
effects of the flooding and subsequent reservoir releases, were prepared 
from data collected along the centerlines of the drowned river channels 
upstream from the dams and from data collected at deep sites near the dams 
of each reservoir. The density profiles were computed from the water tem- 
perature and the dissolved-solids concentration as estimated from the spe- 
cific conductance. 

The following table shows the variations, before and after the floods, 
in the average specific conductance along the centerline section of the 
three reservoirs and the range of specific conductance at site 08092600 
on the Brazos River below Whitney Lake. 



Before flood 



After flood 



Hubbard Creek 
Reservoir 

Possum Kingdom 
Reservoir 

Whitney Lake 

Brazos River below July 1-Aug. 1 
Whitney Lake 



Date 
(1978) 


Specific , 
conductance— 


June 9 


1450 


June 13 


4000 


June 23 


1600 



Date 
(1978) 

Aug. 29 



Aug. 30 

Sept. 5 
1300-1600 Aug. 2-31 



Specific , J 
conductance— 

700 



1600 

3000 
1600-3700 



1/ In micromhos per centimeter at 25°C. 

After the flood in the Hubbard Creek area, the average specific con- 
ductance of the water in Hubbard Creek and Possum Kingdom Reservoirs was 
diluted from 1450 to 700 and from 4000 to 1600 micromhos, respectively 
(figs. 14 and 15). In Whitney Lake, the most downstream reservoir of the 
three, the specific conductance increased from 1600 to 3000 micromhos (fig 
16). 



•18- 



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HUBBARD !\ 
\ 



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RESERVOIR 



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EXPLANATION 
P| 

Reservoir data-collection site 

Stream channel 



Base from Texas Generol 
Highway map 



) 



p 9 



< 



P|0 

t 



if 

Pii 



7 



/ 



p|U" 



ft^ Sandy Creek 



FIGURE 10. -Locations of water-quality data-collection sites on Hubbard Creek Reservoir 



STEPHENS 

COUNTY 




explanation 

Fr Fc ^l 

F • • • F 

Reservoir troverse ond 
doto-colleclion sites 






if 



f 



Stream channel 
I 2 MILES 



Base from Texas General 
Highway map 



FIGURE 11. -Locations of water-quality data-collection sites on Possum Kingdom Reservoir 




I 2 MILES 



8ose from Tenos Genero! 
Highway mop 



FIGURE 12.-Locat,ons of water-quality data-collection sites on Whitney Lake 



96 e 



POSSUM KINGDOM 
RESER VOIR 




V 




EXPLANATION 



A Streamf low or reservoir -content station 
and station number 

^ Chemical -quality or sediment station 



IOOMILES 



FIGURE 13. -Locations of water-quality data-collection sites on the Brazos River 























DENSITY, IN GRAMS PER MILLILITER 








.996 .997 998 999 


1200 


I 1 i i I I i I I 1 




i i i i i i i i i i i i i i 








HUBBARD CREEk 




SITE PI 








Hubbard Creek arn 










1175 


Reservoir surfaca 




- 


— 




- 






_ 












1150 









\ /— Density — 








_ 




/ 








- 




\J \ ; 






1125 


— — "^^ 1 




[-^Specific 

conductance J 








r-~~ p ' 3 c" 




i • ™ 








-pi 










1100 













Q 












> 


Approximate 










(SI 


for centerline 










2 


- 




- 






111 






■ i 






> lrt -, c 


i i i i i i i i i 1 L 




i i i i 1 i i i i 1 i i i i 






O lU/O L — ■ — ■ — ■ — ■ — ■ — ■ — ■ — ■ — ■ — ■ — 
CD 






< MILES UPSTREAM FRl 






1- 






UJ 






Id 






Li_ 






Z 1200 
UJ 


> i i i i i i i i | 

HUBBARD CREEK- 




i i i i il i i i ii i i i 

SITE P 6 






o 


Big Sandy Creek - 










1- 












\- 














-} 1175 
< 






f l 


^ — Specific 

' conductance 




: 1 : 






: I : 




K 






1150 




— /\ — 












/ \^-Density 








\*r pio" 












yr P9 












1125 
















P6 




- 1 - 






1100 

IQ-7C 


Approximate 
for centerline^ 

i i i i i i i i i 1 L 




i i i i 1 i i i i 1 i i i i 






5 15 1000 2000 3000 




MILES UPSTF 


SPECIFIC CONDUCTANCE 
( micromhos per centimeter at 25°Celsius) 




- 


ANATION 




- See figure 10 for 




INE OF EQUAL SPECIFIC 




il 


-Interval 100 micromhos 
25° 


FIGURE 14. 


-Specific conduc 


:tance and densit 

















1 1 n 

HUBBARD CREEK RESERVOIR JUNE 9, 1978 
Hubbord Creek arm 

Reservoir surface \ 


; 






\\ \i'\ \ 


- 


ii 50 


- 


^^— *-*-*ipi8 


- 






/PI5 


- 


1 1 2 5 






■ 






r-*"*^ ^Appro»imafe reset voir-oottom 


- 




-PI 


PI3 profile, I97B 


■ 


1100 






_ 






lor cenlerl.ne profile * 1450 


- 


1075 


"l , 


1 1 


, , ■ 



_i i ■ i i i i i i i i i i <_ 


SITE PI 


_ 





'-_ 


: 


'- 


\y-Densily " 


Specific —^ 


\ : 


- 


\ - 




' ; 


1 J 








" .... i .... | .... ~ 



< MILE5 UPSTREAM FROM DAM ALONG DROWNED RIVER CANNEL 







1 1 


1 1 1 1 1 1 1 




HUBBARD CREEK RESERVOIR AUGUST 


29 


1978 


- 


Hubbord Creek orm Rese 




surfoce 


- 




f 


,*- 










k 




1 


\ / 


- 




\f' 


- 






pie 










5 — 


800 _ ^S^ pl6 




- 


;z" 


"zz-Jpg z ---2?~-jy pis 




_ 


: 


/30p^\_ ApprOMmote fesBfv0 




- 


PpT 


^pi3 profile, I97B 




- 


















- 


Approximate overage specific condi 


cton 


:e 




for cenlerhne profile section = 700 




- 










h i i 


| | 




, ," 



I I I I I I I I I I I 



I ' ' ' ' I 




MILES UPSTREAM FROM DAM ALONG DROWNED RIVER CHANNEL 





1 ' 


1 


1 


i i i • I I I I i 


I l l i i | l i 


I I I 1 


1 1 J 






HUBBARD CREEK RESERVOIR JUNE 9.1978 










Si 


s 


rtdy Creek orm 






. 


117ft 










Reservoir su 


face 


" 


ISO 








8 






: 


1125 








P9 profile, 1978 


-bottom 


- 




P6 














1100 






A 








-_ 








fo 




1450 




- 


□ rs 




J_l 


I 


iiil,.,, 


1 , , . 







_i i i i i i i 

SITE P6 

'. Specific — 

", , , . 1 , . 


1 1 | 1 1 1 l_ 

^^-Oensily " 
, , 1 , , , ," 



MILES UPSTREAM FROM HUBBARD CREEK ARM 



1000 2000 3000 

SPECIFIC CONDUCTANCE 
(micromhos per centimeter ot 25°Celsius) 



J ' " 1 

HUBBARD CREE 
Big Sandy Creek a 


< RESERVOIR AUGUST 


29 


1978 


1 1 


r / 


/ 


-' 


s 


-_ 


■ = . s oO^ 


J^***"^ P\Z 






- 


— «ss^<r p, ° 


^Approximate reservoi 
profile, 1978 




"•" 


'•_ 


' P6 

Approximate 
— for centerlme 


veroge specific conduct 
profile section = 700 


» 




J 


- 




















> < 1 


1, 




1,11 


' ' 



1 ' ' I ' ' ' ' I 

SITE P 6 




i .... i 



LES UPSTREAM FROM r 



i CREEK ARM 



EXPLANATION 
PI6 SAMPLING SITE- -See figure 10 for 



-1500— APPROXIMATE LINE OF EQUAL SPECIFIC 
CONDUCTANCE — Intervol 100 micromhos 
per centimeter of 25" 



FIGURE I4.4p.in, conductance, end dens ity ,„, H.bbcd C. k R...r,.i, du,in 9 ;„.. and A u9 u, 7 



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DENSITY, IN GRAMS PER MILLILITER 
996 998 I 000 I 002 



1 ' I | ■ ■ ■ ' | ' ' ' ' | ' ' ' ' I ' ■ ' ' I ' ' ' ' I ' ' 
POSSUM KINGDOM RESERVOIR, JUNE 13,1978 




Approximate average specific conductona 
for centerlme-profile section 
of reservoir = 4000 



I i i i i 1 i i i i I i I i ' I ■' 'i I 



J_L i i I i 



I I I | I I I I | I I I I 
SITE Ac 



J I I I I I 



_' ' ' 1 ' ' ' ' 


I ' ' 


1 ' ' ' ' 


| , i . i | i i 


i i i i i > 


- 


- POSSUM KINGDOM 


RESERVOIR AUGUST 


30, 1978 




- 


► 








/ 


- 




1 2000/^^— Approximate reser 
]3000$' p,ofMe ' l9T8 

/ //PIO yS 


voir-bottom 


- 


^^^ 




,// 






J 


^^~-'ooo ' 


V 

'EC 


Fc / 


Approximate reser 
profile, 1946 


voir-bottom 


- 


5\ 2O92^20£ 


/DC 

.r y 

S Be S 

>-Ac / 


Appr 




speific conductance 




-_ 


- yS 


for c 


'nterline-profile 


ection 




- 




of re 


er voir = 1600 






-j 


: 


1 , , 


....... 


!,,,,!,, 


,,-!,,, 


\ 




J I I L 



10 20 30 40 50 60 

MILES UPSTREAM FROM DAM ALONG DROWNED RIVER CHANNEL 



70 2000 4000 6000 

SPECIFIC CONDUCTANCE 
(m.cromhos per centimeter at 25°celsiusJ 



EXPLANATION 



Ac SAMPLING SITE-See figure II for 

location 

-1500 — APPROXIMATE LINE OF EQUAL SPECIFIC 
CONDUCTANCE — Intervals ore either 100 
or 500 micromhos per centimeter at 25° 
Celsius 



FIGURE 15. -Specific conductance and density for Possum Kingdom Reservoir during June and August 1978 



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DENSITY, IN GRAMS PER MILLILITER 
996 998 1.000 1002 



I I | I I I I | I M I | I I I I 1 I I I ' | M " I 
WHITNEM LAKE JUNE 23, 1978 




Approximate average specific conauctanc< 
lor centerline-profile section of Whitney 
lake = 1600 



I .... I .. . i I 



SITE AC 



I I I I | I I I I | I I I 




I ... I .... I 



_l 1 . I 1 1 


, , , | 


1 1 


l , , , , , | , , , ■ | - l l i | l l 




WHITNEY 


LAKE SEPTEt 


ABER 5-6,1978 


- 


: 






Lake surface 


: 


- 






/ / * 
/ 1 y 




- 






/ Approximate reservoir bottor 

J ^^ profile 


ri - 


/- 


-2500 — 




/ • 


- 


-^^^Z 


-3000 

■3500 ■ 




/ PI4 


\ 


^ Js °o y 


/ Fc 
'EC 


Gc 


Approximate average specific conductance 
for centerline-profile section of Wtiitney 
lake •- 3000 


] 


^^^/Oc 








— 1 










I 


4c 








— 


- 








- 


- 








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- 








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i ' 


< 1 • > i • 


H 



I ■ ' ' ' I 




10 20 30 40 50 60 

MILES UPSTREAM FROM DAM ALONG DROWNED RIVER CHANNEL 



70 1000 2000 3000 4000 

SPECIFIC CONDUCTANCE 
( micromhos per centimeter at 25° Celsius) 



EXPLANATION 



Ac SAMPLING SITE--See f.gure 12 for 

location 

— 1500 — APPROXIMATE LINE OF EQUAL SPECIFIC 
CONDUCTANCE — Intervals ore either 100 
or 500 micromhos per centimeter at 2 5° 
Celsius 



FIGURE 16. -Specific conductance and density tor Whitney Lake during June and September 1978 



The daily specific conductance of water at five sites on the Brazos 
River (fig. 13) below Whitney Lake ranged from about 500 to 1500 micromhos 
for about a month prior to the flood (fig. 17). A few days after the flood 
and the increased releases from the upstream reservoirs, the specific con- 
ductance increased at each of the five sites and reached a maximum of about 
3700 micromhos at site 08092600 below Whitney Dam. The releases from Whit- 
ney Lake (as indicated by the data for site 08092600 on the Brazos River) 
caused two distinct inflections in the specific-conductance curves at the 
four downstream sampling sites (fig. 17). 



WATER-LEVEL CHANGES IN THE EDWARDS AQUIFER 

Water-level hydrographs for selected ground-water observation wells 
in the artesian zone of the Edwards aquifer in south-central Texas (fig. 
18) indicate that the water levels rose substantially between July 10 and 
August 25, 1978. The water levels in these observation wells, which are 
located near pumping centers, are influenced by changes in the pumping 
rates. The water-level rises reflect a reduction in pumping and (or) recharge 
to the aquifer. 



-26- 



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ACCUMULATED fiAINFALL IN INCHES, JULY 10-AUGUST 15,1978 




ALTITUDE OF WATER LEVELS IN WELLS IN FEET ABOVE NGVD, JULY 10-AUGUST 25,1978 




20 30 MILES 



FIGURE 18. -Water-level changes in wells in the Edwards aquifer, July 10-August 25, 1978 



SELECTED REFERENCES 

Ellsworth, C. E., 1923, The floods in central Texas in September 1921: 

U.S. Geological Survey Water-Supply Paper 488, 56 p. 
National Oceanic and Atmospheric Administration, 1978, Storm data, August 

1978: Environmental Data and Information Service, National Climatic 

Center, 24 p. 
Schroeder, E. E., Grozier, R. U., Hahl, D. C, and Hulme, A. E., 1974, 

Floods of September-October 1967 in south Texas and northeastern 

Mexico: U.S. Geological Survey Water-Supply Paper 1880-B, 111 p. 
Schroeder, E. E., and Massey, B. C, 1977, Techniques for estimating the 

magnitude and frequency of floods in Texas: U.S. Geological Survey 

Water-Resources Investigations 77-110, 22 p. 
U.S. Water Resources Council, 1977, Guidelines for determining flood flow 

frequency: Hydrology Committee, Bulletin 17A, 26 p., 14 apps. 
Yost, I. D., 1963, Floods of April -June 1957 in Texas and adjacent states: 

U.S. Geological Survey Water-Supply Paper 1652-B, 321 p. 



-29- 



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-34- 



Table 2. 



-Locations of discontinued stream-gaging stations and 
miscellaneous discharge-measurement sites 



Map Station 
number number 



Name and location 



BRAZOS RIVER BASIN 

4 08082900 North Elm Creek near Throckmorton. Lat 33°10'50", long 99°22'05, Throckmorton County, 
Hydrologic Unit 12060101, at culvert on State Highway 24, and 11.3 miles (18.2 kilom- 
eters) west of Throckmorton. 

IS 08085300 Humphries Draw near Haskell. Lat 33°10'40", long 99°34'30", Haskell County, Hydro- 
logic Unit 12060101, at culvert on State Highway 24, and 9.3 miles (15.0 kilometers) 
east of Haskell . 



17 08086050 



59 



60 



66 



67 



08148500 



08152800 



08153100 



Deep Creek at Moran. Lat 32°33'33", long 99°10'11", Shackelford County, Hydrologic 
Unit 12060105, at downstream side of bridge on U.S. Highway 380, 0.8 mile (1.3 kilom- 
eter) north of Moran, and 10.8 miles (17.4 kilometers) upstream from Hubbard Creek. 

COLORADO RIVER BASIN 

Bear Creek at Interstate Highway 10 near Junction. Lat 30°31'S7", long 99°50'H", 
Kimble County, Hydrologic Unit 12090202, 1.3 miles (2.1 kilometers) upstream from 
Interstate Highway 10, 1.5 miles (2.4 kilometers) upstream from mouth, and 3.4 miles 
(5.5 kilometers) west of Junction. 

North Llano River near Junction. Lat 30°31'06", long 99°48'39", Kimble County, Hydro- 
logic Unit 12090202, 1,000 feet (305 meters) upstream from remains of old Wilson Dam, 
2.1 miles (3.4 kilometers) northwest of Junction, and 4 miles (6 kilometers) upstream 
from confluence with South Llano River. 

Spring Creek near Fredericksburg. Lat 30°18'10", long 99°03'20", Gillespie County, 
Hydrologic Unit 12090206, downstream side of bridge on U.S. Highway 290, and 11 miles 
(18 kilometers) west of Fredericksburg. 

Cane Branch at Stonewall. Lat 30 c 14'07", long 98°39'21", Gillespie County, Hydrologic 
Unit 12090206, at culvert on U.S. Highway 290 at Stonewall, and 0.6 mile (1.0 kilome- 
ter) upstream from Pedernales River. 

GUADALUPE RIVER BASIN 



73 



74 



08166300 



Turtle Creek at State Highway 16 near Kerrville. Lat 29°57'41", long 99°12'35", Kerr 
County, Hydrologic Unit 12100201, 0.1 mile (0.2 kilometer) upstream from Lambs Creek, 
at State Highway 16 and 9.0 miles (14.5 kilometers) southwest of Kerrville. 

Turtle Creek tributary near Kerrville. Lat 29°58'11", long 99°11'02", Kerr County, 
Hydrologic Unit 12100201, at culvert on Farm Road 2771, and 5.9 miles (9.5 kilometers) 
south of Kerrville. 



80 



81 



08178900 



North Prong Medina River near Medina. Lat 29°51'49", long 99°22'18", Bandera County, 
Hydrologic Unit 12100302, 0.5 mile (0.8 kilometer) upstream from Lima School, and 12.0 
miles (19.3 kilometers) upstream from mouth. 

Bandera Creek tributary near Bandera. Lat 29°50'51", long 99°06'12", Bandera County, 
Hydrologic Unit 12100302, at culvert on Farm Road 689, and 10 miles (16 kilometers) 
north of Bandera. 



85 08180500 Medina River near Rio Medina. Lat 29°29'53", long 98°54'16", Medina County, Hydrolo- 
gic Unit 12100302, on left bank 233 feet (71 meters) upstream from bridge at Haby's 
crossing, 4.2 miles (6.8 kilometers) northwest of Rio Medina, and 10.4 miles (16.7 
kilometers) upstream from San Geronimo Creek. 



-35- 



Site 



Table 3 .--Water-quality data for Hubbard Creek, June 9 and August 29, 1978 

June 9, 1978 August 29, 1978 

Elevation: 1174.13 feet Elevation: 1181.80 feet 

Contents: 201,200 acre-feet Contents: 299,900 acre-feet 



Depth 
(feet) 


Specific 
conduct- 
ance 
(micro- 
mhos) 


PH 
(units) 


Tem- 
pera- 
ture 
(°C) 


Dis- 
solved 
oxygen 
(mg/L) 


Per- 
cent 
satu- 
ration 


Depth 
(feet) 


Specific 
conduct- 
ance 
(micro- 
mhos) 


pH 
(units) 


Tem- 
pera- 
ture 
(°C) 


Dis- 
solved 
oxygen 
(mg/L) 


Per- 
cent 
satu- 
ration 


1 


1510 


8.1 


25.0 


7.0 


90 


1 


894 


8.0 


27.0 


5.8 


73 


10 


1510 


8.1 


25.0 


7.0 


90 


10 


894 


8.0 


27.0 


5.2 


66 


20 


1510 


8.1 


25.0 


6.9 


88 


20 


894 


7.9 


26.5 


5.1 


65 


30 


1510 


8.1 


24.5 


6.8 


87 


30 


860 


7.4 


26.0 


2.0 


38 


40 


1510 


7.3 


22.5 


1.9 


23 


40 


700 


7.3 


24.5 


1.0 


12 


50 


1510 


7.2 


21.5 


.7 


8 


50 


333 


7.4 


23.0 


.5 


6 


60 


1530 


7.2 


21.0 


.2 


2 


60 


333 


7.3 


23.0 


.4 


5 














65 


333 


7.3 


23.0 


.3 


4 


1 


1520 


8.1 


25.5 


7.1 


92 


1 


894 


8.4 


28.0 


6.7 


86 


13 


1520 


8.1 


25.0 


7.0 


90 


10 


894 


8.2 


27.5 


6.3 


81 














20 


894 


7.6 


26.0 


3.2 


40 














25 


840 


7.5 


26.0 


2.7 


34 


1 


1510 


8.1 


27.5 


7.3 


97 


1 


890 


8.3 


28.0 


6.5 


83 


10 


1510 


8.1 


26.5 


7.4 


97 


10 


880 


8.3 


28.0 


6.2 


79 


20 


1510 


8.1 


26.0 


7.0 


91 


20 


850 


8.1 


27.5 


5.9 


76 


30 


1510 


7.9 


25.0 


6.1 


78 


30 


820 


7.8 


27.0 


5.1 


65 


40 


1510 


7.2 


23.5 


1.4 


18 


40 


730 


7.4 


25.0 


1.9 


23 


50 


1510 


7.2 


22.5 


.3 


4 


50 


390 


7.4 


24.0 


.3 


4 


59 


1510 


7.2 


22.0 


.3 


4 


60 


380 


7.4 


24.0 


.3 


4 














67 


370 


7.3 


24.0 


.3 


4 


1 


1500 


8.1 


27.5 


7.3 


97 


1 


831 


8.3 


28.5 


7.1 


92 


10 


1500 


8.1 


26.5 


7.2 


95 


10 


831 


8.2 


28.0 


6.7 


86 


20 


1500 


8.1 


26.5 


6.9 


91 


20 


821 


8.1 


28.0 


6.2 


79 


30 


1500 


8.0 


26.0 


6.3 


82 


30 


754 


7.3 


26.5 


1.8 


23 


42 


1500 


7.4 


25.5 


3.0 


39 


40 


754 


7.3 


26.5 


1.2 


15 














47 


754 


7.3 


26.5 


1.2 


IS 


1 


1490 


8.1 


26.0 


7.1 


92 


1 


793 


8.1 


27.5 


6.5 


83 


10 


1490 


8.0 


25.5 


6.6 


86 


10 


780 


8.0 


27.0 


6.0 


76 


20 


1490 


8.0 


25.5 


6.3 


82 


20 


740 


7.7 


27.0 


5.1 


65 


33 


1490 


7.8 


25.5 


5.2 


68 


30 


740 


7.6 


27.0 


4.2 


53 














41 


740 


7.3 


27.0 


1.9 


24 


1 


1470 


8.1 


28.0 


7.0 


93 


1 


750 


7.9 


28.0 


6.1 


78 


10 


1470 


8.0 


26.5 


6.5 


86 


10 


739 


7.7 


27.5 


5.3 


68 


23 


1470 


8.0 


26.5 


6.3 


83 


20 


725 


7.4 


27.5 


3.3 


42 














32 


720 


7.3 


27.5 


1.8 


23 


1 


1160 


8.1 


27.5 


8.2 


109 


1 


661 


7.5 


28.0 


4.6 


59 


12 


1210 


7.7 


26.5 


5.6 


74 


10 


640 


7.3 


27.0 


3.2 


41 














21 


625 


7.0 


26.5 


.3 


4 


1 


1510 


8.1 


25.5 


7.2 


94 


1 


890 


8.3 


28.0 


6.6 


85 


10 


1510 


8.1 


25.0 


7.0 


90 


10 


890 


8.2 


28.0 


6.3 


81 


20 


1510 


8.1 


25.0 


6.8 


87 


20 


886 


8.1 


27.5 


5.8 


74 


30 


1510 


8.0 


24.5 


6.2 


79 


30 


841 


7.4 


26.5 


1.8 


23 


40 


1510 


7.3 


23.0 


2.1 


26 


40 


635 


7.3 


25.0 


.4 


5 


55 


1510 


7.2 


22.0 


1.1 


13 


50 


350 


7.3 


26.0 


.3 


4 














58 


280 


7.4 


26.5 


.4 


5 


1 


1510 


8.0 


26.5 


6.8 


89 


1 


870 


8.1 


28.0 


6.0 


77 


10 


1510 


8.0 


26.0 


6.4 


83 


10 


865 


7.9 


27.5 


5.5 


71 


20 


1510 


7.9 


26.0 


5.8 


75 


20 


856 


7.7 


27.5 


4.6 


59 


33 


1510 


7.5 


25.5 


3.3 


43 


30 


850 


7.6 


28.0 


4.1 


53 














36 


845 


7.4 


28.0 


3.4 


44 


1 


1510 


8.1 


26.5 


7.1 


93 


1 


851 


7.6 


28.0 


5.0 


64 


10 


1510 


8.0 


25.5 


6.4 


83 


10 


845 


7.6 


27.5 


4.5 


58 


22 


1510 


7.9 


25.0 


6.1 


78 


20 


840 


7.5 


27.5 


4.1 


53 














31 


793 


7.2 


27.5 


.5 


6 



p l 



P 4 



P 6 



P 9 



P 10 



P ll 



P 12 



P 13 



P 15 



P 16 



-36- 



Table 3. --Water-quality data for Hubbard Creek, June 9 and August 29, 1978--Continued 









June 9, 


1978 










August 29 


, 1978 










Elevation: 1174 


.13 feet 








Elevation 


: 1181 


.80 feet 










Contents: 201, 


200 acre 


-feet 






Contents 


: 299, 


900 acre 


-feet 




Site 


Depth 


Specific 
conduct- 
ance 
(micro- 
mhos) 


pH 


Tem- 
pera- 


Dis- 
solved 


Per- 
cent 


Depth 


Specific 
conduct- 
ance 
(micro- 
mhos) 




pH 


Tem- 
pera- 


Dis- 
solved 


Per- 
cent 




(feet) 


(units) 


ture 
(°C) 


oxygen 
(mg/L) 


satu- 
rati ">n 


(feet) 


(units) 


ture 

(°C) 


oxygen 
(mg/L) 


satu- 
ration 


P 17 


1 


1180 


8.1 


27.0 


7.1 


93 


1 


801 




7.4 


28.0 


4.7 


60 


10 


1200 


7.4 


26.0 


3.1 


40 


10 


797 




7.1 


27.5 


1.2 


15 




18 


1310 


7.2 


26.0 


.6 


8 


24 


725 




7.1 


27.0 


.4 


5 


P 18 


1 


978 


7.7 


26.0 


5.8 


75 


1 


858 




7.4 


28.0 


3.9 


50 


11 


987 


7.3 


25. S 


2.7 


35 


10 


858 




7.2 


28.0 


.9 


12 
















22 


804 




7.1 


26.5 


.3 


4 



-37- 



Table 4 . --Water-quality data for Possum Kingdom Reservoir, June 13 and August 30, 1978 









June 13. 


, 1978 










August 3C 


i, 1978 










Elevation: 994. 


84 feet 








Elevat: 


ion: 999. 


17 feet 










Contents: 486. 


,400 acre-feet 






Contents: 555, 


800 acre-feet 




Site 


Depth 
(feet) 


Specific 
conduct- 
ance 
(micro- 
mhos) 


PH 
(units) 


Tem- 
pera- 
ture 
(°C) 


Dis- 
solved 
oxygen 
(mg/L) 


Per- 
cent 
satu- 
ration 


Depth 
(feet) 


Specific 
conduct- 
ance 
(micro- 
mhos) 


P H 
(units) 


Tem- 
pera- 
ture 
(°C) 


Dis- 
solved 
oxygen 
(mg/L) 


Per- 
cent 
satu- 
ration 


A R 


1 


3860 


8.0 


27.0 


8.1 


107 


1 


887 


8.8 


29.0 


9.2 


121 


10 


3860 


8.0 


26.5 


8.3 


109 


10 


887 


8.6 


28.0 


7.6 


97 




20 


3860 


8.0 


25.5 


8.5 


109 


20 


940 


7.4 


27.5 


2.8 


36 




30 


3860 


7.9 


23.0 


8.3 


102 


30 


980 


7.3 


27.0 


1.2 


15 




40 


3860 


7.8 


17.0 


7.3 


80 


40 


1170 


7.2 


26.0 


.4 


5 




50 


3860 


7.5 


14.5 


6.5 


68 


50 


1620 


7.2 


25.5 


.3 


4 




60 


3860 


7.3 


14.5 


5.8 


60 


60 
65 


2140 
2440 


7.2 
7.3 


26.0 
26.0 


.3 

.4 


4 
5 


A c 


1 


3860 


8.0 


27.0 


8.1 


107 


1 


887 


8.9 


29.0 


9.2 


121 


10 


3860 


8.0 


26.5 


8.2 


108 


10 


887 


8.6 


28.0 


7.8 


100 




20 


3860 


8.0 


26.0 


8.2 


106 


20 


945 


7.4 


27.5 


2.4 


31 




30 


3860 


8.0 


23.5 


8.3 


104 


30 


1000 


7.3 


27.0 


1.1 


14 




40 


3860 


7.9 


17.0 


7.3 


80 


40 


1030 


7.3 


26.5 


.5 


6 




50 


3860 


7.6 


17.0 


6.5 


71 


50 


1730 


7.2 


26.0 


.2 


2 




60 


3860 


7.4 


14.0 


6.2 


64 


60 


2350 


7.2 


25.5 


.2 


2 




70 


3860 


7.2 


12.5 


5.1 


51 


70 


3200 


7.2 


24.0 


.2 


2 




80 


3860 


7.2 


12.0 


4.6 


46 


80 


3820 


7.2 


20.5 


.2 


2 




90 


3860 


7.2 


12.0 


4.2 


42 


90 


3820 


7.1 


17.5 


.2 


2 




100 


3860 


7.0 


12.0 


2.6 


26 


102 


3820 


7.0 


16.5 


.3 


3 


B R 


1 


3890 


8.0 


27.0 


8.0 


105 


1 


790 


8.7 


28.5 


8.1 


105 


10 


3890 


8.0 


27.0 


8.0 


105 


10 


800 


8.6 


28.0 


7.7 


99 




20 


3890 


8.0 


25.5 


8.2 


102 


20 


810 


7.3 


27.5 


5.5 


71 




30 


3890 


7.9 


22.5 


7.7 


94 


30 


820 


7.3 


26.5 


1.6 


20 




40 


3890 


7.4 


16.0 


4.9 


53 


40 


1070 


7.3 


26.0 


.3 


4 




50 


3890 


7.2 


14.0 


4.0 


41 


50 


1710 


7.2 


25.5 


.3 


4 




60 


3890 


7.2 


14.0 


3.9 


40 


60 


2250 


7.2 


25. S 


.3 


4 




70 


3890 


7.2 


14.0 


3.7 


38 


67 


2910 


7.2 


25.5 


.4 


5 


B c 


1 


3890 


8.0 


27.0 


8.0 


105 


1 


790 


8.6 


28.0 


7.6 


97 


10 


3890 


8.0 


26.5 


8.1 


107 


10 


800 


8.4 


28.0 


6.0 


77 




20 


3890 


8.0 


25.0 


8.1 


104 


20 


800 


8.2 


27.5 


6.0 


77 




30 


3890 


7.9 


19.5 


7.3 


85 


30 


820 


7.3 


27.0 


1.8 


23 




40 


3890 


7.5 


16.0 


5.2 


56 


40 


1030 


7.2 


26.0 


.2 


2 




50 


3890 


7.2 


14.0 


4.1 


42 


50 


1640 


7.2 


25.5 


.3 


4 




60 


3890 


7.2 


14.0 


4.1 


42 


60 


1940 


7.2 


25.0 


.3 


4 




70 


3890 


7.2 


13.0 


4.1 


41 


70 


3390 


7.2 


24.0 


.3 


4 




80 


3890 


7.2 


13.0 


3.8 


38 


80 


3820 


7.2 


20.5 


.3 


3 




91 


3890 


7.2 


13.0 


3.. 8 


38 


90 
96 


3820 
3820 


7.1 
7.0 


17.5 
17.0 


.3 

.8 


3 
9 


P 3 


1 


3890 


8.0 


28.0 


8.0 


107 


1 


760 


8.9 


29.0 


9.9 


130 


10 


3890 


8.0 


27.5 


8.1 


108 


10 


760 


8.9 


28.5 


9.1 


118 




20 


3890 


8.0 


24.0 


8.2 


102 


20 


760 


8.7 


28.0 


8.3 


106 




30 


3890 


7.4 


22.5 


4.6 


56 


30 


801 


7.4 


27.0 


2.4 


30 




40 


3890 


7.2 


17.5 


3.0 


33 


40 


965 


7.3 


26.0 


1.0 


12 




50 


3890 


7.0 


15.0 


1.4 


15 


50 


1470 


7.2 


25.5 


.3 


4 




56 


3890 


7.0 


15.0 


1.2 


13 


59 


1780 


7.2 


25.5 


.4 


5 


c c 


1 


4010 


8.0 


27.0 


7.9 


104 


1 


710 


8.6 


28.0 


8.3 


106 


10 


4010 


8.0 


26.5 


7.9 


104 


10 


710 


8.6 


28.0 


7.7 


99 




20 


4010 


7.9 


25.0 


7.5 


96 


20 


710 


8.4 


27.5 


7.4 


95 




30 


4010 


7.5 


20.0 


5.3 


62 


30 


750 


7.4 


26.5 


3.4 


43 




40 


4010 


7.2 


15.0 


2.3 


24 


40 


950 


7.3 


26.0 


1.5 


19 




50 


4010 


7.1 


14.0 


2.0 


21 


50 


1770 


7.2 


25.5 


.3 


4 




60 


4010 


7.1 


13.5 


2.1 


21 


60 


2970 


7.1 


25.5 


.3 


4 




70 


4010 


7.1 


13.0 


2.1 


21 


70 


3680 


7.1 


24.5 


.3 


4 




78 


4010 


7.1 


13.0 


2.3 


23 


80 


3800 


7.0 


21.0 


.5 


6 



-38- 



Table 4. --Water-quality data for Possum Kingdom Reservoir, June 13 and August 30, 1978--Continued 









June 13 


1978 










August 3C 


, 1978 










Elevation: 994 


84 feet 








E lev at 


ion: 999. 


17 feet 










Contents: 486 


400 acre-feet 






Contents: 555, 


800 acre-feet 




Site 


Depth 
(feet) 


Specific 
conduct- 
ance 
(micro- 
mhos) 


pH 
(units) 


Tem- 
pera- 
ture 
(°C) 


Dis- 
solved 
oxygen 
(mg/L) 


Per- 
cent 
satu- 
ration 


Depth 
(feet) 


Specific 
conduct- 
ance 
(micro- 
mhos) 


pH 
(units) 


Tem- 
pera- 
ture 
(°C) 


Dis- 
solved 
oxygen 
(mg/L) 


Per- 
cent 
satu- 
ration 


P 5 


1 


3940 


8.0 


27.5 


7.7 


103 


1 


720 


8.6 


28.0 


8.2 


105 


10 


3940 


8.0 


27.0 


7.7 


101 


10 


720 


8.5 


28.0 


8.1 


104 




20 


3940 


7.8 


26.5 


7.2 


95 


20 


720 


8.5 


28.0 


8.0 


103 




30 


3940 


7.8 


25.5 


5.0 


64 


30 


720 


8.5 


27.5 


8.1 


104 




34 


3940 


7.7 


25.5 


6.1 


78 


40 


830 


7.3 


27.0 


2.3 


29 


P 7 


1 


3930 


8.0 


27.5 


7.6 


101 


1 


770 


8.6 


28.0 


7.6 


97 


10 


3930 


8.0 


27.0 


7.5 


99 


10 


770 


8.6 


28.0 


7.2 


92 




20 


3930 


7.8 


26.0 


7.4 


96 


20 


770 


8.4 


27.0 


6.6 


84 




30 


3930 


7.6 


23.0 


5.1 


63 


30 


870 


7.2 


27.0 


1.0 


13 




40 


3930 


7.0 


23.0 


1.7 


21 


40 


1130 


7.2 


26.0 


.3 


4 




50 


3930 


7.0 


22.0 


.9 


11 


54 


770 


7.2 


26.0 


.5 


6 




60 


3930 


7.0 


22.0 


.9 


11 














D c 


1 


3970 


8.0 


27.5 


7.7 


103 


1 


732 


8.4 


27.5 


7.1 


91 


10 


3970 


8.0 


27.5 


7.7 


103 


10 


742 


8.4 


27.5 


6.9 


88 




20 


3970 


8.0 


26.5 


7.7 


101 


20 


742 


8.3 


27.5 


6.8 


87 




30 


3970 


7.2 


23.0 


3.4 


42 


30 


762 


7.5 


27.0 


3.6 


46 




40 


3970 


7.2 


16.0 


1.1 


12 


40 


970 


7.2 


25.5 


1.2 


15 




50 


4030 


7.2 


14.5 


.9 


9 


50 


1740 


7.2 


25.5 


.2 


2 




60 


4030 


7.2 


14.5 


.8 


8 


60 


3180 


7.1 


25.5 


.3 


4 




65 


4030 


7.2 


14.5 


1.1 


11 


72 


3440 


7.0 


24.5 


.3 


4 


E c 


1 


4150 


8.0 


27.0 


7.9 


104 


1 


779 


8.5 


29.5 


7.8 


103 


10 


4150 


8.0 


26.5 


7.7 


101 


10 


779 


8.4 


29.0 


7.5 


99 




20 


4150 


7.8 


25.5 


7.0 


90 


20 


779 


8.0 


28.0 


5.7 


73 




30 


4380 


7.0 


23.0 


1.0 


12 


30 


810 


7.3 


27.0 


1.4 


18 




40 


4380 


7.0 


18.0 


.3 


3 


40 


1020 


7.2 


26.5 


.5 


6 




50 


4380 


7.0 


16.5 


.4 


4 


50 
58 


2170 
2430 


7.2 
7.2 


26.0 
26.0 


.3 

.4 


4 
5 


F c 


1 


4250 


8.1 


28.0 


8.0 


107 


1 


770 


8.5 


29.0 


8.0 


105 


10 


4250 


8.0 


27.0 


7.5 


99 


10 


840 


8.3 


29.0 


7.0 


92 




20 


4250 


7.8 


26.5 


6.9 


91 


20 


960 


7.9 


28.0 


4.4 


56 




30 


4320 


7.2 


24.5 


3.8 


48 


30 


1410 


7.2 


27.0 


.3 


4 




43 


4420 


6.9 


20.0 


.3 


3 


42 


1570 


7.2 


27.0 


.3 


4 


G c 


1 


4210 


8.0 


28.0 


8.0 


107 


1 


1080 


8.5 


29.5 


8.1 


107 


10 


4240 


8.0 


27.0 


7.5 


99 


10 


1030 


8.0 


28.5 


5.6 


73 




20 


4240 


7.7 


26.5 


6.0 


79 


20 


1030 


7.8 


28.0 


4.5 


58 




34 


4440 


7.4 


25.8 


4.7 


61 


30 
40 


1420 
1640 


7.2 
7.2 


27.0 
26.5 


.3 

.3 


4 
4 


P 9 


1 


4240 


8.1 


28.0 


9.1 


121 


1 


1300 


7.9 


29.0 


5.8 


76 


10 


4240 


8.1 


27.5 


8.6 


115 


10 


1300 


7.6 


28.5 


4.2 


55 




20 


4290 


7.2 


26.5 


3.3 


43 


20 


1480 


7.2 


27.5 


.9 


12 




30 


4290 


7.2 


26.5 


3.0 


39 


33 


1480 


7.2 


27.5 


.5 


6 


p io 


1 


4110 


8.1 


29.5 


9.8 


132 


1 


1120 


8.7 


30.0 


8.7 


116 


10 


3960 


7.9 


28.0 


8.3 


111 


10 


1330 


8.5 


29.0 


7.3 


96 




14 


3960 


7.9 


28.0 


7.8 


104 


19 


3350 


7.8 


29.0 


4.8 


63 



-39- 



Table 5 . --Water-quality data for Whitney Lake, June 23 and September 5-6, 



1978 









June 23, 


, 1978 








September 5-6, 197S 












Elevation: 521. 


69 feet 








Elevation 


: 532, 


,44 feet 












Contents: 406, 


,100 acre-feet 






Contents 


: 615 


,000 acre 


-feet 




Site 


Depth 


Specific 
conduct - 


PH 


Tem- 
pera- 


Dis- 
solved 


Per- 
cent 


Depth 


Specific 
conduct- 
ance 


P H 


Tem- 
pera- 


Dis- 
solved 


Per- 
cent 




(feet) 


(micro- 
mhos) 


(units) 


ture 
(°C) 


oxygen 
(mg/L) 


satu- 
ration 


(feet) 


(micro- 
mhos) 


units) 


ture 
(°C) 


oxygen 
(mg/L) 


satu- 
ration 


A L 


1 


1410 


8.0 


26.6 


6.3 


82 


1 


2240 


8.3 


30.0 


7 


.9 


105 


10 


1410 


8.0 


26.6 


6.3 


82 


10 


2240 


8.3 


29.5 


7 


.9 


105 




20 


1410 


8.0 


26.5 


5.9 


77 


20 


2240 


8.2 


29.0 


7 


.3 


96 




34 


1410 


7.4 


24.8 


1.0 


13 


30 

42 


2240 
3130 


7.8 
7.2 


28.0 
28.0 


5 


.3 
.5 


69 
6 


A c 


1 


1410 


8.1 


26.7 


6.8 


88 


1 


2240 


8.3 


30.0 


7 


.8 


105 


10 


1410 


8.1 


26.6 


6.7 


87 


10 


2240 


8.3 


29.0 


7 


.8 


103 




20 


1410 


8.0 


26.3 


5.4 


70 


20 


2240 


8.2 


29.0 


7 


.4 


97 




30 


1410 


7.6 


25.3 


2.4 


31 


30 


2290 


7.6 


28.0 


4 


.0 


53 




40 


1410 


7.4 


22.8 


.2 


2 


40 


2950 


7.2 


28.0 




.3 


4 




50 


1400 


7.4 


20.7 


.2 


2 


50 


3490 


7.1 


26.5 




.3 


4 




60 


1400 


7.4 


19.6 


.2 


2 


60 


3500 


7.1 


25.5 




.3 


4 




70 


1390 


7.4 


18.7 


.2 


2 


70 


3320 


7.1 


25.5 




.3 


4 




80 


1380 


7.4 


17.4 


.2 


2 


80 


3060 


7.1 


24.0 




.4 


5 




89 


1370 


7.4 


16.6 


.2 


2 


90 
101 


2360 
2240 


7.1 
7.1 


21.0 
20.0 




.4 
.6 


5 
7 


B c 


1 


1450 


8.2 


27.4 


6.8 


89 


1 


2220 


8.3 


29.5 


7 


.8 


100 


10 


1450 


8.3 


27.2 


6.8 


89 


10 


2220 


8.3 


29.0 


7 


.6 


100 




20 


1480 


8.0 


26.8 


5.2 


68 


20 


2220 


8.2 


28.5 


6 


.7 


87 




30 


1460 


7.9 


26.5 


4.5 


58 


30 


2270 


7.7 


28.0 


4 


.4 


57 




40 


1410 


7.4 


22.8 


.2 


2 


40 


3210 


7.2 


27.5 




.2 


3 




50 


1400 


7.4 


20.9 


.2 


2 


50 


3520 


7.1 


26.5 




.2 


3 




60 


1390 


7.4 


20.0 


.2 


2 


60 


3600 


7.1 


26.0 




.3 


4 




70 


1390 


7.4 


19.2 


.2 


2 


70 


3500 


7.1 


25.0 




.3 


4 




80 


1380 


7.2 


18.3 


.2 


2 


80 


3190 


7.1 


24.0 




.3 


4 




85 


1370 


7.4 


17.5 


.2 


2 


90 
96 


2640 
2470 


7.1 
7.1 


21.5 
21.0 




.4 
.5 


5 
6 


c c 


1 


1460 


8.2 


28.0 


6.8 


91 


1 


2200 


8.3 


29.5 


7 


.7 


101 


10 


1460 


8.3 


28.0 


6.8 


91 


10 


2200 


8.3 


28.5 


7 


.2 


94 




20 


1460 


8.2 


27.9 


6.7 


88 


20 


2200 


8.1 


28.5 


6 


.2 


81 




30 


1460 


8.2 


27.6 


6.6 


87 


30 


2260 


7.8 


28.0 


4 


.9 


63 




40 


1520 


7.5 


25.9 


1.3 


17 


40 


3240 


7.2 


27.5 




.2 


3 




50 


1390 


7.4 


21.3 


.2 


2 


50 


3560 


7.1 


26.5 




.3 


4 




60 


1380 


7.4 


20.1 


.2 


2 


60 


3580 


7.1 


26.0 




.3 


4 




70 


1370 


7.4 


19.0 


.2 


2 


70 


3520 


7.1 


25.5 




.3 


4 




78 


1360 


7.4 


19.0 


.2 


2 


80 
90 


3300 
3000 


7.1 

7.1 


24.5 
22.5 




.3 
.5 


4 
6 


D c 


1 


1470 


8.2 


28.4 


6.8 


88 


1 


2180 


8.4 


29.5 


7 


.9 


107 


10 


1470 


8.3 


28.5 


6.8 


88 


10 


2210 


8.2 


28.5 


6 


.4 


86 




20 


1480 


8.3 


28.6 


6.7 


87 


20 


2280 


7.6 


28.0 


3 


.6 


48 




30 


1510 


8.2 


28.3 


6.3 


84 


30 


2930 


7.2 


28.0 




.2 


3 




40 


1660 


7.6 


27.4 


2.8 


37 


40 


3510 


7.2 


27.0 




.3 


4 




50 


1500 


7.4 


22.5 


.1 


1 


50 


3670 


7.1 


26.5 




.3 


4 




60 


1440 


7.4 


20.9 


.1 


1 


60 


3720 


7.1 


26.0 




.3 


4 




66 


1430 


7.4 


20.9 


.1 


1 


70 
76 


3680 
3660 


7.1 
7.1 


25.5 
25.5 




.3 
.4 


4 
5 


E c 


1 


1510 


8.1 


29.2 


6.7 


91 


1 


2210 


8.3 


29.0 


7 


.5 


99 


10 


1510 


8.2 


29.1 


6.7 


91 


10 


2220 


8.1 


28.5 


6 


.5 


86 




20 


1510 


8.2 


29.0 


6.7 


91 


20 


2230 


7.9 


28.5 


5 


.2 


69 




30 


1510 


8.2 


28.9 


6.7 


91 


30 


3290 


7.2 


28.0 




.2 


3 




40 


1540 


8.1 


28.2 


5.9 


79 


40 


3590 


7.1 


27.0 




.2 


3 




45 


1740 


7.6 


28.1 


2.6 


35 


50 


3680 


7.1 


26.5 




.2 


3 




50 


1470 


7.4 


24.0 


.2 


2 


60 


3680 


7.1 


26.0 




.3 


4 




54 


1450 


7.4 


22.5 


.2 


2 


67 


3680 


7.1 


26.0 




.5 


6 



-40- 



Table 5. --Water-qual ity data for Whitney Lake, June 23 and September 5-6, 1978--Continued 

June 23, 1978 September 5-6, 1978 

Elevation: 521.69 feet Elevation: 532.44 feet 

Contents: 406,100 acre-feet Contents: 615,000 acre-feet 



Specific _ „. _ Specific „ „. n 

1 . Tern- Dis- Per- v , . Tern- Dis- Per- 

Site _, ... conduct- ,, , , „ .. conduct- ,. , , 

Depth pH pera- solved cent Depth pH pera- solved cent 

(feet) , . (units) ture oxygen satu- (feet) . . (units) ture oxveen satu- 
1 ' (micro- v ' , „. ,1,1 «. • (micro- .,,„. , ',, , 
j^hojO ( C) (mg/L) ration ^^ ( C) (mg/L) rat , on 

P 1 1450 8.3 29.6 7.2 97 1 2120 8.0 29.5 7.0 92 

10 1450 8.3 29.4 7.2 97 10 2240 7.8 28.5 5.5 69 

16 1450 8.1 28.8 5.7 77 20 2280 7.6 Ja.5 4.0 52 

27 2360 7.2 28.5 .8 10 

V 1 1480 8.3 30.1 7.1 96 1 2200 8.3 29.5 7.7 105 

10 1480 8.3 29.4 6.9 93 10 2210 7.8 28.5 4.8 64 

20 1480 8.2 29.0 6.7 91 20 2270 7.4 28.0 2.9 39 

30 1480 7.9 28.9 4.2 57 30 3260 7.2 28.0 .2 3 

36 1480 7.5 28.5 1.3 17 40 3480 7.1 27.0 .3 4 

49 3620 7.1 27.0 .4 5 

F 1 1510 8.2 29.5 6.9 93 1 2220 8.2 29.5 6.7 91 

10 2240 7.9 29.0 5.5 72 

20 2360 7.3 28.5 2.5 34 

30 2640 7.1 28.0 .2 3 

40 3540 7.1 27.0 .2 3 

55 3650 7.0 26.5 .3 4 

G 1 1580 8.2 29.2 6.6 89 1 2290 7.8 29.0 6.0 79 

10 2320 7.7 29.0 5.6 74 

20 2480 7.2 28.5 1.7 22 

30 2870 7.1 28.5 .2 3 

40 3490 7.1 27.5 .2 3 

50 3660 7.0 27.5 .4 5 

P 1 1510 8.2 29.1 6.9 93 1 2200 8.2 29.0 7.2 95 

10 2200 8.1 28.5 6.8 87 

20 2210 7.4 28.0 2.8 37 

30 3050 7.1 28.0 .4 5 

42 3470 7.0 27.0 .5 6 

P 1 2490 8.4 30.8 8.4 115 1 2740 7.8 30.0 6.1 82 

10 2740 7.6 29.5 4.5 61 

20 2980 7.1 29.0 .2 3 

27 3050 7.0 29.0 .3 4 

P 1 2650 8.3 30.3 7.4 100 1 3030 7.9 29.5 6.6 89 

10 3030 7.6 29.0 4.8 63 

20 3040 7.1 28.5 .2 3 

27 3050 7.1 28.5 .2 3 



10 


1510 


8.2 


29.4 


6.9 


93 


20 


1510 


8.2 


29.2 


6.8 


92 


30 


1510 


8.2 


28.8 


6.7 


91 


40 


1510 


8.2 


28.6 


6.7 


89 


46 


1510 


8.2 


28.4 


6.4 


85 


1 


1580 


8.2 


29.2 


6.6 


89 


10 


1610 


8.0 


29.0 


5.4 


73 


20 


1640 


8.0 


28.7 


5.3 


71 


30 


1730 


7.8 


28.7 


4.2 


56 


41 


2000 


7.4 


28.5 


1.6 


21 


1 


1510 


8.2 


29.1 


6.9 


93 


10 


1510 


8.3 


28.9 


6.9 


93 


20 


1510 


8.2 


28.8 


6.8 


92 


30 


1510 


8.2 


28.7 


6.4 


85 


1 


2490 


8.4 


30.8 


8.4 


115 


10 


2480 


8.1 


29.7 


5.6 


76 


16 


2430 


7.7 


29.5 


3.7 


50 


1 


2650 


8.3 


30.3 


7.4 


100 


10 


2720 


8.1 


29.8 


6.3 


85 


20 


2770 


8.0 


29.6 


5.5 


74 


27 


2770 


7.9 


29.6 


5.0 


68 



-41- 



Table 6. --Station descriptions and discharge data 



-42- 



BRAZOS RIVER BASIN 

(1) 08082500 BRAZOS RIVER AT SEYMOUR, TX 
(National stream-quality accounting network) 

LOCATION.— Lat 33°34'51", long ?9°16'02", Baylor County, Hydrologic Unit 12060101, on left bank at upstream side of bridge on U.S. 
Highways 277 and 283, 0.8 mi* 1 1 .3 km) upstream from Wichita Valley Railway bridge, 1.0 mi (1.6 km) southwest of courthouse in 
Seymour, and at mile 847.4 (1,363.5 km). 

DRAINAGE AREA. --15, 538 mi 2 (40,243 km 2 ), approximately, of which 9,566 mi 2 (24,776 km 2 ) probably is noncontributing. 

PERIOD OF RECORD. — November 1923 to August 1978. 

GAGE .--Water-stage recorder. Datum of gage is 1,238.97 ft (377.638 m) National Geodetic Vertical Datum of 1929. Prior to Apr. 6, 
1972, at datum 2.00 ft (0.610 m) higher. 

REMARKS. --Smal 1 diversions above station for irrigation and oilfield operation. National Weather Service gage-height telemeter at 
station. 

MAXIMA: FOR AUGUST 19 78. --Discharge, 28,200 ft>/s (799 m 3 /s) Aug. 5, 1978, gage height, 14.20 ft (4.328 m). 

FOR PERIOD 1923 to July 1978. --Maximum discharge, 95,400 ft 3 /s (2,700 m 3 /s) Oct. 16, 1926, gage height, 17.16 ft (5.230 m) , 
from floodmarks, present datum, from rating curve extended above 48,000 ft 3 /s (1,360 m 3 /s) on basis of slope-area meas- 
urement of 95,400 ft 3 /s (2,700 m 3 /s); maximum gage height, 23.00 ft (7.010 m), present datum, Sept. 28, 1955, discharge 
71,200 ft 3 /s (2,020 m"/s). 

HISTORIC. --Maximum stage since 1906 was that of Sept. 28, 1955, and the maximum discharge was that of Oct. 16, 1926. A 
flood in 1906 reached about the same stage as flood in 1955. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


.00 


8 




923 


16. . . 


94 


24... 




73 


2 


.00 


9 




575 


17. .. 


85 


25... 




58 


3 


.42 


10... 




412 


18.. . 


72 


26... 




51 


4 


3,590 


11 ... 




500 


19... 


58 


27. .. 




47 


5 


19 ,200 


12... 




543 


20. .. 


47 


28... 




42 


6 


4,380 


13. .. 




286 


21 . .. 


50 


29. .. 




38 


7 


1 ,940 


14... 




193 


22. . . 


62 


30... 




37 






15. .. 




139 


23. .. 


83 


31... 




36 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER SECOND 








1 
66 


080 


MONTHLY 








,700 


RUNOFF, 














.08 





















Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge Date Hour 



Gage 
height 



Discharge 



Auq. 


3 - 0600 


1.80 


22 




1200 


2.31 


110 




2400 


2.23 


92 


Aug. 


4 - 0200 


2.17 


79 




0400 


2.32 


113 




0600 


2.62 


200 




0800 


3.24 


437 




1200 


4.00 


792 




1400 


5.75 


2,280 




1600 


7.15 


4,270 



Aug. 4 



Aug. 5 - 



2000 


9.00 


9,000 


Aug. 


6 


- 0600 


7.85 


5,810 


2400 


10.75 


14,700 






1200 
1800 


7.16 
6.69 


4,250 
3,450 


0200 


12.10 


19,800 






2400 


6.31 


2,860 


0400 


13.50 


25,400 












0600 


14.20 


28,200 


Aug. 


7 


- 1200 


5.56 


1,900 


0800 


14.00 


27,400 






2400 


4.93 


1,260 


1200 


12.50 


21 ,400 












1800 


10.60 


14,200 


Aug. 


8 


- 1200 


4.47 


907 


2400 


8.92 


8,750 






2400 


4.14 


711 



Period 



Highest mean discharge, in cubic feet per second. 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1925 to July 1978- 



19,200 
62,600 



9,060 
35,200 



4,430 
17,800 



BRAZOS RIVER BASIN 

(2) 08082700 MILLERS CREEK NEAR MUNDAY, TX 

LOCATION. — Lat 33°19'45", long 99°27'53", Throckmorton County, Hydrologic Unit 12060101, near right bank on downstream side of 
bridge on Farm Road 1720, 12.7 mi (20.4 km) southeast of Munday, and 24.6 mi (39.6 km) upstream from Brazos River. 

DRAINAGE AREA.--104 mi 2 (269 km 2 ). 

PERIOD OF RECORD.— July 1963 to August 1978. 

GAGE. --Water-stage recorder. Altitude of gage is 1,350 ft (411 m), from topographic map. 

REMARKS. — No diversion above station. 

MAXIMA: FOR AUGUST 1978.— Discharge, 34,600 ft 3 /s (980 m 3 /s) Aug. 4, 1978, gage height, 17.53 ft (5.343 m). 

FOR PERIOD 1963 to July 1978.— Maximum discharge, 1,040 ft 3 /s (29.5 m 3 /s) Aug. 26, 1971, gage height, 14.75 ft (4.496 m). 
HISTORIC. --Maximum stage since at least 1883 occurred June 13, 1930, and exceeded 18.0 ft (5.49 m); maximum stage since 
1930, 18.0 ft (5.49 m) in October 1962, from information by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1. . . 

2. .. 

3.. . 

4. .. 

5. .. 

6. .. 

7. . . 


.00 8... 

.00 9... 

.00 10.. 

8,730 11.. 

3,370 12.. 

369 13.. 

20 14.. 

15.. 


6.5 16. .. 
4.0 17... 

2.3 18... 
4.5 19... 

1.4 20... 
.22 21... 
.09 22... 
.03 23... 


01 24... .00 
01 25... .00 
00 26... .00 
00 27.. .00 
00 28... .00 
00 29... .00 
00 30... .00 
00 31... .00 


MONTH' v MFflN nisrHARRF in niRtr ffft pfr sFr.riNn 


403 


MONT 
RUNO 


1LY TOTAL ACRE-FEET 




24,800 




4.47 



Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge Date Hour 



Gage 
height 



Discharge 



Aug. 4 - 



0300 


0.52 







Aug. 


4 


- 1400 


17.53 


34,600 


Auq. 


5 


- 2400 


12.63 


790 


0400 


.52 




1.0 






1500 


17.34 


30,600 












0500 


1.01 




2.0 






1600 


17.05 


25,400 


Aug. 


6 


- 0600 


11.27 


589 


0600 


2.76 




32 






1800 


16.32 


15,600 






1200 


8.35 


366 


0800 


3.96 




82 






2200 


15.58 


8,910 






1800 


4.49 


114 


0900 


5.84 




216 






2400 


15.40 


7,690 






2400 


3.08 


42 


1000 


8.45 




372 






















1100 


10.94 




555 


Aug. 


5 


- 0600 


14.95 


5,280 


Aug. 


7 


- 0600 


2.53 


25 


1200 


13.86 


2 


,080 






1200 


14.18 


2,750 






1800 


1.99 


13 


1300 


17.07 


25 


,700 






1800 


13.52 


1,530 






2400 


1.78 


9.9 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1964 to July 1978- 



,730 
973 



4,160 
802 



1,790 
376 



-44- 



BRAZOS RIVER BASIN 

(3) 08082800 MILLERS CREEK RESERVOIR NEAR ROMARTON, TX 

LOCATION. --Lat 33°24'32", long 99°23'19' Baylor County, Hydrologic Unit 12060101, at intake tower on left bank of Millers Creek, 
1.1 mi (1.8 km) upstream from dam, 7.1 mi (11.4 km) southeast of Bomarton, and 13.2 mi (21.2 km) upstream from mouth. 

DRAINAGE AREA.— 240 mi 2 (622 km - -). 

PERIOD OF RECORD. --August 1974 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929 (Freese, Nichols, 8 Endress Consulting 
Engineers bench mark). 

REMARKS. --The reservoir is formed by an earthfill dam 9,250 ft (2,820 m) long. The dam was completed in 1974 and storage began in 
July 1974. The reservoir is used for municipal, mining, and industrial water supply. The uncontrolled emergency spillway is an 
open cut 3,000 ft (910 m) wide located on left bank about 800 ft (240 m) upstream from leveel. The service spillway is an 
uncontrolled morning-glory-type drop inlet 16.5 ft (5.0 m) square that discharges through a 5.0-foot-square (1.5 m) concrete 
conduit. Low-flow releases are made by valves in the outlet vault of the drop inlet. Figures given herein' represent total 

contents. Data regarding the dam and reservoir are given in the foll owin g table: 

Elevation Capacity 

_ (feet) (acre-feet ) 

Top of dam.V .".. ."7.Y.7 .".".".". ." l,355.n 

Crest of spillway 1,340.1 49,080 

Crest of spillway 1,331.2 25,180 

Lowest gated outlet (invert) 1,305.0 1,660 

Dead sto rage 1,303.4 1,240 

COOPERATION. --The area-capacity tables, prepared from data of Sept. 17, 1965, were furnished by Freese, Nichols, and Endress, 
Consulting Engineers. Record of diversions furnished by North Central Texas Municipal Water Authority. 

MAXIMA: FOR AUGUST 1978.— Contents, 34,480 acre-ft (42.5 hm 5 ) Aug. 6, 1978, elevation, 1,335.30 ft (406.99 m). 

FOR PERIOD 1974 to July 1978.— Maximum contents, 3,440 acre-ft (4.24 hm^) June 3, 1977, elevation, 1,309.89 ft (399.254 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 2400 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1 


1,100 


8... 


30,480 


16.. 


26,060 


24... 


24,950 


2... 


1 ,100 


9... 


29,180 


17.. 


25,900 


25... 


24,800 


3 


1,160 


10.. 


28,210 


18.. 


25,760 


26... 


24,690 


4. .. 


27,250 


11.. 


27,590 


19.. 


25,560 


27. . 


24,570 


5 


27,340 


12.. 


27,130 


20.. 


25,460 


28... 


24,420 


6... 


33,760 


13.. 


26,710 


21.. 


25,300 


29. .. 


24,310 


7 


31 ,760 


14.. 


26,480 


22.. 


25,260 


30. .. 


24,190 






15.. 


26,240 


23.. 


25,180 


31... 


24,060 


CHANC 


E IN CONTENTS, IN 


ACRE-F 










22,960 













-45- 



BRAZOS RIVER BASIN 

(5) 08083240 CLEAR FORK BRAZOS RIVER AT HAWLEY, TX 

LOCATION. --Lat 32°35'53", long 99"48'53", Jones County Hydrologic Unit 12060102, on right bank 90 ft (27 m) upstream from upstream 
bridge on U.S. Highways 83 and 277, 0.8 mi (1.3 km) south of Hawley, 7.4 mi (11.9 km) upstream from Mulberry Creek, and 188.6 mi 
(303.5 km) upstream from mouth. 

DRAINAGE AREA. --1,416 mi 2 (3,667 km 2 ). 

PERIOD OF RECORD. --October 1967 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,612.45 ft (491.475 m) National Geodetic Vertical Datum of 1929. Prior to Dec. 21, 
1973, at datum 0.80 ft (0.244 m) higher. 

REMARKS. --Lake Sweetwater, capacity 11.900 acre-ft (14.7 hm') is located on a tributary upstream from gage. 

MAXIMA: FOR AUGUST 1978.— Discharge 2,540 ft 3 /s (71.9 nWs) Aug. 4, 1978, gage height, 14.64 ft (4.462 m). 

FOR PERIOD 1967 to July 1978.— Maximum discharge, 6,170 ft 5 /s (175 nr/s) Sept. 11, 1969, gage height, 19.31 ft (5.886 m), 

present datum. 
HISTORIC. --Maximum stage since at least 1915 occurred in 1932; second highest stage in 1957, 25.0 ft (7.62 m), present 

datum, from information by local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 
DISCHARGE DAY DISCHARGE DAY .DISCHARGE DAY 



DAY 



DISCHARGE 



1. .. 




03 


8... 


12 


16 


2. .. 




02 


9. . . 


9.2 


17 


3.. . 


428 




10.. 


7.6 


18 


4. .. 


2,010 




11 .. 


6.3 


19 


5. . . 


350 




12.. 


5.3 


20 


6. .. 


49 




13.. 


4.7 


21 


7. .. 


19 




14.. 


4.1 


22 








15.. 


3.7 


23 



3.3 


24 


3.0 


25 


2.8 


26 


2.6 


27 


2.5 


28 


2.4 


29 


2.3 


30 


2.2 


31 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


95.1 


MONTHLY TOTAL ACRE-FEET 




RUNOFF, IN INCHES 







Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1968 to July 1978- 



2,010 
4,860 



929 

3,530 



411 
1,690 



-46- 



BRAZOS RIVER BASIN 

(6) 08083245 MULBERRY CREEK NEAR HAWLEY, TX 

LOCATION. --lat 32°34'04", long 99°47'32", Jones County, Hydrologic Unit 12060102, on right bank at downstream side of downstream 
bridge on U.S. Highways 83 and 277, 3.3 mi (5.3 km) south of Hawley, and 5.8 mi (9.3 km) upstream from Clear Fork Brazos 
River. 

DRAINAGE AREA.--205 mi 2 (531 km 3 ). 

PERIOD OF RECORD.— December 1967 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,615.98 ft (492.551 m) National Geodetic Vertical Datum of 1929. 

REMARKS. — No known diversion above station. 

MAXIMA: FOR AUGUST 1978. --Discharge, 1,770 ft 3 /s (50.1 m 3 /s) Aug. 4, 1978, gage height, 13.98 ft (4.261 m). 

FOR PERIOD 1967 to July 1978. --Maximum discharge, 2,500 ft 3 /s (70.8 m 3 /s) July 21, 1975, gage height, 15.53 ft (4.734 m). 
HISTORIC. --Maximum stage since at least 1932, about 16.0 ft (4.88 m) in 1957, from floodmarks. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 


DAY 


2.0 


24.. 


1.2 


25. . 


.71 


26.. 


.37 


27.. 


.19 


28.. 


.09 


29.. 


.04 


30. . 


.01 


31.. 



DISCHARGE 



.00 


8. 


.00 


9. 


513 


10 


1 ,330 


11 


76 


12 


23 


13 


12 


14 




15 



9.1 


16.. 


7.5 


17.. 


6.8 


18.. 


6.2 


19.. 


5.4 


20.. 


4.4 


21.. 


3.6 


22.. 


2.7 


23.. 



.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER 


SECOND 


64.7 


MONTHLY TOTAL ACRE-FEET 




3,980 


RUNOFF, IN INCHES 




.36 





Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1969 to July 1978- 



1,330 
1,630 



640 
922 



282 

537 



-47- 



BRAZOS RIVER BASIN 

(7) 08083300 ELM CREEK NEAR ABILENE, TX 

LOCATION. --Lat 32°21'08", long 99°48'27", Taylor County, Hydrologic Unit 12060102, on right bank at upstream side of bridge on Farm 
Road 707, 2.8 mi (4.5 km) southeast of Caps, 7.5 mi (12.1 km) southwest of Abilene, and 35.1 mi (56.5 km) upstream from mouth. 

DRAINAGE AREA. --1 33 mi 2 (344 km 2 ). 

PERIOD OF RECORD. — September 1963 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,804.15 ft (549.90 m) National Geodetic Vertical Datum of 1929 (Texas Department 
of Highways and Public Transportation bridge plans). 

REMARKS. --Since 1921, flow largely regulated by Lake Abilene, capacity 7,900 acre-ft (9.74 hm 3 ), 12 mi (19 km) upstream. Rain gage 
located at station. 

MAXIMA: FOR AUGUST 1978. --Discharge, 1,830 ft 3 /s (51.8 m 3 /s) Aug. 3, 1978, gage height, 13.26 ft (4.042 m). 

FOR PERIOD 1963 to July 1978. --Maximum discharge, 4,570 ft 3 /s (129 m 3 /s) Sept. 18, 1974, gage height, 18.68 ft (5.694 m). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 


DAY 


.00 


24.. 


.00 


25.. 


.00 


26.. 


.00 


27.. 


.00 


28.. 


.00 


29.. 


4.6 


30.. 


.35 


31.. 



DISCHARGE 



1. . . 


.00 


2. .. 


.00 


3... 


1 ,050 


4. .. 


177 


5. .. 


1.9 


6. .. 


.10 


7. .. 


.00 



9. 

10. 

11, 

12. 

13. 
14. 
15. 



.00 


16. . 


.00 


17.. 


.00 


18.. 


.00 


19.. 


.00 


20.. 


.00 


21.. 


.00 


22.. 


.00 


23.. 



.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND. 

MONTHLY TOTAL ACRE-FEET 

RUNOFF, IN INCHES 



39.8 
2,450 

.35 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1965 to July 1978- 



1,050 
1,630 



410 
1,030 



176 
566 



-48- 



BRAZOS RIVER BASIN 

(8) 08083400 LITTLE ELM CREEK NEAR ABILENE, TX 

LOCATION. --Lat 32°23'29", long 99°51'08", Taylor County, Hydrologic Unit 12060102, on right bank at downstream side of bridge on 
Farm Road 707, 1.2 mi (1.9 km) north of Caps, 4.6 mi (7.4 km) southwest of intersection of U.S. Highways 277 and 83 in Abilene, 
and 10.3 mi (16.6 km) upstream from mouth. 

DRAINAGE AREA. --39. 1 mi 2 (101.3 km 2 ). 

PERIOD OF RECORD. --September 1963 to August 1978. 

GAGE. --water-stage recorder. Datum of gage is 1,786.12 ft (544.409 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --No known diversion above station. Rain gage located at station. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 1,340 ft*/S (37.9 m 3 /s) Aug. 3 1978, gage height, 9.50 ft (2.896 m). 

FOR PERIOD 1963 to July 1978. --Maximum discharge, 2,180 ft 3 /s (61.7 m 3 /s) Sept. 18, 1974, gage height, 11.52 ft 

(3.511 m). 
HISTORIC. --Maximum stage since at least 1903, about 15 ft (4.6 m) in 1913, from information by local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 
DISCHARGE DAY DISCHARGE DAY DISCHARGE DAY 



DAY 



DISCHARGE 



1.. 
2. . 
3.. 

4. . 

5. . 

6. . 

7. . 





.00 


8. 




.00 


9. 


698 




10 


96 




11 


1 


.4 


12 




.05 


13 




.00 


14 
15 



00 


16 


00 


17 


00 


18 


00 


19 


00 


20 


00 


21 


00 


22 


00 


23 



00 


24 


00 


25 


00 


26 


00 


27 


00 


28 


00 


29 


00 


30 


00 


31 



.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


25.7 


MONTHLY TOTAL ACRE-FEET 


1 ,580 


RUNOFF, IN INCHES 


.76 





Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1965 to July 1978- 



698 
948 



265 
421 



114 
189 



-49- 



BRAZOS RIVER BASIN 

(9) 08083420 CAT CLAW CREEK AT ABILENE, TX 

LOCATION. --Lat 32°28'31", long 99°44'56", Taylor County, Hydrologic Unit 12060102, in Sears Park 320 ft (98 m) downstream from 
bridge on Ambler Street in Abilene and 1.8 mi (2.9 km) upstream from mouth. 

DRAINAGE AREA. --13. mi 2 (33.7 km 2 ). 

PERIOD OF RECORD.— October 1970 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,682.32 ft (512.77 m), Corps of Engineers bench mark. 

MAXIMA: FOR AUGUST 1978. -Discharge, 1,310 ft 3 /s (37.1 m 3 /s) Aug. 3, 1978, gage height, 6.60 ft (2.012 m). 

FOR PERIOD 1970 to July 1978.— Maximum discharge, 1,200 ft 3 /s (34.0 m 3 /s) Sept. 18, 1974, gage height, 6.41 ft (1.954 m). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1 




.00 


8 






.00 


16... 


00 


24. .. 


.00 


2 




.00 


9 






.74 


17... 


00 


25... 


.00 


3 




431 


10. . . 






.06 


18... 


00 


26... 


.00 


4 




115 


11... 






.00 


19... 


00 


27... 


.00 


5 




5.9 


12... 






.00 


20... 


00 


28... 


1.9 


6 




.43 


13... 






.00 


21... 


73 


29... 


.06 


7 




.00 


14... 






.00 


22... 


13 


30... 


.00 








15... 






.00 


23... 


00 


31... 


.00 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER 


SECOND. 








17.9 


MONTHLY 








1 ,100 


RUNOFF, 
















1.59 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1971 to July 1978- 



431 
480 



184 
221 



79 
117 



-50- 



BRAZOS RIVER BASIN 

(10) 08083470 CEDAR CREEK AT ABILENE, TX 

LOCATION. --Lat 32°26'56", long 99°43'13", Taylor County, Hydrologic Unit 12060102, on right bank at upstream side of North Second 
Street Bridge and State Highway 355 at Abilene, 0.2 mi (0.3) downstream from Lytle Creek, 4.1 mi (6.6 km) downstream from Button- 
willow Creek, 5.9 mi (9.5 km) upstream from Rainy Creek, 7.2 mi (11.6 km) downstream from Kirby Lake, and 9.8 mi (15.8 km), up- 
stream from mouth. 

DRAINAGE AREA. --1 19 mi J (308 km J ). 

PERIOD OF RECORD.— October 1970 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,677.67 ft (511.354 m) National Geodetic Vertical Datum of 1929. 

REMARKS.— Flow is partly regulated by Ltyle Lake, capacity of 1,200 acre-ft (1.48 hm 3 ), and Lake Kirby, capacity 7,620 acre-ft 
(9.40 hm 3 ). 

MAXIMA: FOR AUGUST 1978. --Di scharge, 3,830 ft»/s (108 m 3 /s) Aug. 3, 1978, gage height, 11.93 ft (3.636 m). 

FOR PERIOD 1970 to July 1978. --Maximum discharge, 4,670 ft 3 /s (132 m 3 /s) Sept. 18, 1974, gage height, 12.54 ft (3.822 m). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 


DAY 


.62 


24.. 


.53 


25.. 


.85 


26.. 


.54 


27.. 


.32 


28. . 


2.2 


29.. 


1.1 


30.. 


.22 


31.. 



DISCHARGE 



.76 

.94 



931 

882 

55 

9 

4, 



9. . 
10. 
11. 
12. 
13. 
14. 
15. 



2.3 


16.. 


5.6 


17.. 


1.3 


18.. 


1.1 


19.. 


1.7 


20. . 


1.2 


21.. 


2.0 


22.. 


1.9 


23.. 



.21 
.20 
.28 
.30 
1.5 
.32 
.66 
.64 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


61.7 


MONTHLY TOTAL ACRE-FEET 


3,790 


RUNOFF, IN INCHES 


.60 





Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1971 to July 1978- 



931 
1,710 



623 
937 



270 
531 



-51- 



BRAZOS RIVER BASIN 



(11) 08083500 FORT PHANTOM HILL RESERVOIR NEAR NUGENT, TX 

LOCATION. --Lat 32°36'58", long 99°40'05", Jones County, Hydrologic Unit 12060102, at outlet gate tower near right bank, 120 ft (37 
m) upstream from dam on Elm Creek, 4.3 mi (6.9 km) upstream from mouth, and 5.4 mi (8.7 km) south of Nugent. 

DRAINAGE AREA.--470 mi 2 (1,217 km 2 ). 

PERIOD OF RECORD. --July 1940 to August 1978. Prior to October 1965, monthend contents only. 

GAGE. — Nonrecording gage. Datum of gage is 1,580.78 ft (481.822 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --The reservoir is formed by a rock-faced earthfill dam 3,740 ft (1,140 m) long. The dam was completed and storage began in 
October 1938. The uncontrolled service spillway is a cut channel through natural ground with a concrete ogee weir located 0.7 mi 
(1.1 km) from right end of dam. The service outlet works consist of a concrete tower with a 4.0- by 7.0-foot (1.2 by 2.1 m) con- 
duit. The service tower contains five gated openings at various elevations. The dam and lake are owned by the city of Abilene 
and were built to impound water for municipal use. Since July 1974, the West Texas Utility Co. has operated a steam generating 
powerplant on the reservoir. During the year, the city of Abilene diverted 4,400 acre-ft (5.43 hm 3 ) from Clear Fork Brazos River 
into Fort Phantom Hill Reservoir and an undetermined amount of floodflow was diverted by gravity ditch from Deadman Creek into 
the reservoir. The capacity table was based on a survey of Oct. 2, 1953. Figures given herein represent total contents. Data 
reg arding the dam and reservoir are given in the following table: 



Top of dam 

Crest of spil lway 

Highest gated outlet (invert) 

Lowest gated outlet (invert) 

COOPERATION. --Records of gage heights and diversions furnished by the city of Abilene, 
tion Service. 



Gage height 
(feet) 



69.2 

55.1 

28.0 

1.6 



Capacity 
(acre-feet) 



74,310 
10,330 



Capacity table furnished by Soil Conserva- 



MAXIMA (at 0800): FOR AUGUST 1978.— Contents, 50,370 acre-ft (62.1 hm 3 ) Aug. 6-10, 1978, gage height, 48.4 ft (14.75 m). 

FOR PERIOD 1940 to July 1978. --Maximum contents observed, 89,910 acre-ft (111 hm 3 ) May 25, 1957, gage height, 
58.7 ft (17.89 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 0800 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1. .. 


26,780 


8... 


50,370 


16.. 


49,750 


24... 


48,530 


2... 


26,590 


9. . . 


50,370 


17. . 


49,440 


25... 


48,530 


3. .. 


26,780 


10.. 


50,370 


18.. 


49,440 


26... 


48,530 


4. . . 


38,590 


11.. 


50,060 


19.. 


49,440 


27.. 


48,230 


5. .. 


49,130 


12.. 


50,060 


20.. 


49,130 


28... 


48,230 


6. .. 


50,370 


13.. 


50,060 


21. . 


48,830 


29. . . 


48,230 


7. .. 


50,370 


14.. 


49,750 


22.. 


48,830 


30... 


47,940 






15. . 


49,750 


23.. 


48,830 


31... 


47,940 


CHANf 


iE IN CONTENTS, IN 


ACRE-Fi 


:et 








20,970 













-S2- 



BRAZOS RIVER BASIN 

(12) 08084000 CLEAR FORK BRAZOS RIVER AT NUGENT, TX 

LOCATION. --Lat 32°41'24", long 99°40'09", Jones County, Hydrologic Unit 12060102, on right bank 33 ft (10 m) downstream from bridge 
on Farm Road 600 at Nugent, 2 mi (3 km) downstream from Elm Creek, 4 mi (6 km) upstream from Deadman Creek, and 167.8 mi (270.0 
km) upstream from mouth. 

DRAINAGE AREA. --2, 199 mi 2 (5,695 km 2 ). 

PERIOD OF RECORD. --February 1924 to August 1978. 

GAGE.— Water-stage recorder. Datum of gage is 1,531.91 ft (466.926 m) National Geodetic Vertical Datum of 1929 (levels by Brazos 
River Authority). Prior to Dec. 12, 1933, nonrecording gage at site 575 ft (175 m) downstream at same datum. 

REMARKS. --Flow affected by four reservoirs with a capacity of 103,600 acre-ft (128 hm 3 ). Numerous diversions above station for 
municipal supply and oilfield operation materially affect low flow. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 2,840 ft 3 /s (80.4 m 3 /s) Aug. 4, 1978, gage height, 9.97 ft (3.039 m). 

FOR PERIOD 1924 to July 1978. --Maximum discharge observed, 47,000 ft 3 /s (1,330 (m 3 /s) Sept. 8, 1932, gage height, 27.05 

ft (8.245 m), site then in use, from rating curve extended above 25,000 ft 3 /s (708 m 3 /s). 
HISTORIC— Maximum stage, 30 ft (9.1 m) in 1876; floods in 1900 and May 1923 reached stages of 24 and 24.5 ft (7.3 and 7.47 

m), respectively, from information by local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 
DISCHARGE DAY DISCHARGE DAY DISCHARGE DAY 



DAY 



DISCHARGE 



1... 




01 


8. .. 


20 


16 


2. .. 




02 


9... 


26 


17 


3... 


537 




10.. 


26 


18 


4. .. 


2,370 




11 .. 


8.2 


19 


5. .. 


1,010 




12.. 


6.8 


20 


6. .. 


145 




13.. 


5.5 


21 


7. .. 


42 




14.. 


5.7 


22 








15.. 


5.0 


23 



4.7 


24 


4.5 


25 


4.6 


26 


4.5 


27 


4.0 


28 


4.5 


29 


11 


30 


3.3 


31 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


138 


MONTHLY TOTAL ACRE -FEET 


R .470 





Period 



Highest mean discharge, in cubic feet per second 

for the indicated number' of consecutive days 

1 3 7 



August 1978 

1938 to July 1978- 



2,370 
18,800 



1,310 
15,100 



593 

8,710 



-53- 



BRAZOS RIVER BASIN 

(13) 08084500 LAKE STAMFORD NEAR HASKELL, TX 

LOCATION. --Lat 33°04'44", long 99°34'52", Haskell County, Hydrologic Unit 12060103, on left bank at intake structure of West Texas 
Utilities Co. steam powerplant at Lake Stamford on Paint Creek, 1.0 mi (1.6 km) upstream from dam, 1.7 mi (2.7 km) upstream from 
California Creek, 10 mi (16 km) southeast of Haskell, and 21.8 mi (35.1 km) upstream from mouth. 

DRAINAGE AREA. --368 mi 2 (953 km 2 ). 

PERIOD OF RECORD. --July 1953 to August 1978. 

GAGE.--Nonrecordi ng gage read once daily. Datum of gage is 2.77 ft (0.84 m) National Geodetic Vertical Datum of 1929 (levels by 
Freese, Nichols, and Endress, Consulting Engineers). 

REMARKS. --The lake is formed by a rolled-fill earthen dam 3,600 ft (1,097 m) long. The dam was completed in March 1953, and delib- 
erate impoundment began in June 1953. The emergency spillway is an uncontrolled natural channel located near right end of dam. 
The service spillway is an uncontrolled channel excavated through natural ground, 169 ft (52 m) wide, located 900 ft (270 m) to 
left of left end of dam. The service outlet is a controlled 24-inch-diameter (610 mm) concrete pipe that is used for low-flow 
releases. During the current year, the cities of Stamford and Hamlin diverted 1,840 acre-ft (2.27 hm 3 ) for municipal use. The 
capacity table is based on sedimentation survey of 1966. Gage-height record was furnished by West Texas Utilities Co. from their 
powerplant 1.0 mi (1.6 km) upstream from dam. Figures given herein represent total contents. Data regarding the dam and lake 

ar e given in the following table: ^_ 

Gage height Capacity 

(feet) (acre-feet ) 

Top of dam 1,434.0 

Crest of spillway 1,425.8 

Crest of spillway 1,414.0 53,070 

Lowest gated outlet (invert) 1,380.0 358 

COOPERATION. — The capacity table furnished by the Soil Conservation Service. The diversions furnished by city of Stamford. 

MAXIMA (at 0800): FOR AUGUST 1978. --Contents , 103,600 acre-ft (128 hm 3 ) Aug. 5, 1978, gage height, 1,422.18 ft (433.480 m). 
FOR PERIOD 1953 to July 1978.— Maximum contents, 74,100 acre-ft (91.4 hm 3 ) Sept. 9, 10, 1962, gage height, 
1,416.6 ft (431.78 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 0800 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1. .. 


16,800 


8. .. 


80,640 


16.. 


62,020 


24... 


57,920 


2... 


16,800 


9. .. 


75,610 


17. . 


61,500 


25. . . 


57,420 


3... 


16,610 


10. . 


72,020 


18.. 


60,460 


26. .. 


56,920 


4. . . 


75,610 


11. . 


69,700 


19. . 


58,930 


27.. 


56,430 


5. .. 


102,100 


12.. 


66,880 


20.. 


58,930 


28... 


56,430 


6. .. 


94,460 


13. . 


64,690 


21.. 


58,420 


29. .. 


56,430 


7. .. 


86,620 


14. . 


64,150 


22. . 


58,420 


30... 


55,940 






15.. 


63,080 


23.. 


57,920 


31... 


55,940 


CHAN! 


SE IN CONTENTS, IN 


ACRE-F 


:et 








39,140 















-54- 



BRAZOS RIVER BASIN 

(14) 08084800 CALIFORNIA CREEK NEAR STAMFORD, TX 

LOCATION. --Lat 32°55'51", long 99°38'32", Jones County, Hydrologic Unit 12060103, near right bank at downstream side of bridge on 
Farm Road 142, 9 mi (14 km) east of Stamford, and 19.4 mi (31.2 km) upstream from Paint Creek. 

DRAINAGE AREA. --478 mi J (1,238 km 2 ). 

PERIOD OF RECORD.— October 1962 to August 1978. 

GAGE. --Water-stage recorder. Altitude of gage is 1,470 ft (448 m), from topographic map. 

REMARKS. --Three small diversions above station. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 40,000 ft 3 /s (1,130 m 3 /s) Aug. 4, 1978, gage height, 31.00 ft (9.449 m). 

FOR PERIOD 1962 to July 1978. --Maximum discharge, 7,420 ft 3 /s (210 m 3 /s) May 6, 1969, gage height, 27.12 ft (8.266 m), from 

rating curve extended above 21.0 ft (6.40 m) on basis of indirect discharge measurement of peak flow. 
HISTORIC. --Maxumum stage since at least 1897, 31.00 ft (9.449 m) Aug. 4, 1978. Other large floods occurred June 10, 1962, 

gage height 29.6 ft (9.02 m), and July 1961 (stage unknown). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1.. . 


.00 


8. 


2... 


.00 


9. 


3... 


895 


10 


4. .. 


20,400 


11 


5. . . 


2,280 


12 


6. .. 


84 


13 


7. . . 


28 


14 
15 



1 


16. . 


8.2 


17.. 


5.7 


18.. 


4.6 


19.. 


4.1 


20.. 


3.5 


21.. 


3.4 


22.. 


3.4 


23.. 



3.7 


24. . 


3.5 


25.. 


3.3 


26. . 


3.1 


27.. 


2.9 


28. . 


2.7 


29.. 


2.8 


30. . 


2.7 


31.. 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


767 


MONTHLY TOTAL ACRE-FEET 


47 ,200 


RUNOFF, IN INCHES 


1 .85 





Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Gage 
height 



Gage, 
height 



Gage 
height 



Aug. 3 - 1000 
1100 
1200 
1400 
1600 
1800 
2000 
2200 
2400 



6.38 

6.67 

7.38 

8.40 

10.33 

13.14 

16.31 

24.38 

27.90 



0.44 Aug. 4 - 0200 29.25 15,700 



6. 
44 
107 
270 
600 
,190 
,260 



9,670 



0400 


30.20 


24,800 


0600 


30.94 


38,600 


0700 


31.00 


40,000 


0800 


30.92 


38,200 


1200 


30.07 


23,000 


1500 


29.34 


16,400 


2000 


28.14 


10,500 


2400 


27.17 


7,550 



Aug. 5 



Aug. 6 - 



0600 


24.82 


4,640 


0900 


21.00 


2,500 


1200 


15.20 


941 


1500 


12.25 


485 


2000 


10.13 


251 


2400 


9.38 


185 


0400 


8.37 


105 


0800 


7.73 


64 


1200 


7.33 


40 


2400 


7.30 


38 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1963 to July 1978- 



20,400 
5,820 



7,860 
4,950 



3,380 
3,040 



-55- 



BRAZOS RIVER BASIN 

(16) 08085500 CLEAR FORK BRAZOS RIVER AT FORT GRIFFIN, TX 

LOCATION. --Lat 32°56'04", long 99°13'27", Shackelford County, Hydrologic Unit 12060104, on right bank just downstream from pier of 
bridge on old Fort Griff in-Throckmorton Road, 0.4 mi (0.6 km) northeast of Fort Griffin, 1.0 mi (1.6 km) upstream from bridge on 
U.S. Highway 283, 1.7 mi (2.7 km) upstream from Mill Creek, and 74.6 mi (120.0 km) upstream from mouth. 

DRAINAGE AREA. --3, 988 mi 2 (10,329 km 2 ). 

PERIOD OF RECORD. --December 1923 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,174.09 ft (357.863 m) National Geodetic Vertical Datum of 1929. Prior to June 23, 
1932, nonrecording gage at same site and datum. 

REMARKS. --Diversions above station for irrigation, municipal supply and oilfield operations materially affect low flow. Gage-height 
telemeter at station. 

MAXIMA: FOR AUGUST 1978.— Discharge, 149,000 ft 3 /s (4,220 m 3 /s) Aug. 4, 1978, gage height, 38.88 ft (11.851 m). 

FOR PERIOD 1923 to July 1978. --Maximum discharge, 33,600 ft 3 /s (952 m 3 /s) Sept. 10, 1932, gage height, 35.09 ft (10.695 m). 
HISTORIC. --Maximum stage since at least 1876, 38.88 ft (11.851 m) Aug. 4, 1978. Flood in September 1900 reached a stage 
of 38.0 ft (11.58 m); flood in July 1876 was probably higher; from information by local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


.00 


8 


4,090 


16... 


601 


24. .. 




177 


2 


.00 


9 


2,880 


17... 


484 


25... 




166 


3 


988 


10. .. 


2,240 


18... 


395 


26... 




154 


4 


72,800 


11... 


2,240 


19... 


326 


27... 




64 


5 


67,900 


12... 


1,440 


20... 


272 


28... 




2.7 


6 


19,800 


13... 


1 ,110 


21... 


235 


29... 




65 


7 


7,430 


14... 


762 


22. .. 


206 


30. .. 




101 






15... 


730 


23... 


192 


31... 




94 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 


IN CUBIC 


FEET PER SECOND, 








6 
373 


,060 


MONTHLY 








,000 

















Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 
Date Hour ^eW\t Discharge Date Hour ^Mht Dischar 9 e Date Hour height Discnar 9 e 



Aug. 3 



Aug. 4 



2100 


1.54 





2200 


6.28 


1,360 


2300 


19.20 


13,900 


2400 


25.20 


16,900 


0100 


28.81 


20,800 


0500 


35.66 


43,200 


0800 


36.56 


57,000 


1200 


35.58 


39,500 


1500 


36.32 


52,000 



Aug. 4 



Aug. 5 



Aug. 6 



1700 


38.10 


108,000 


Aug. 


6 


- 2400 


28.05 


10,400 


1900 


38.81 


142,000 












2100 


38.88 


149,000 


Aug. 


7 


- 1200 


21.55 


7,340 


2400 


38.76 


141 ,000 






2400 


16.15 


5,160 


0400 


38.18 


107,000 


Aug. 


8 


- 1200 


13.17 


4,040 


1200 


36.75 


59,600 






2400 


11.48 


3,360 


2400 


34.40 


28,600 


















Aug. 


9 


- 1200 


10.18 


2,850 


1200 


32.80 


20,800 






2400 


9.19 


2,500 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1925 to July 1978- 



72,800 
30,800 



53,500 
24,000 



25,400 
15,300 



-56- 



BRAZOS RIVER BASIN 

(18) 08086150 NORTH FORK HUBBARD CREEK NEAR ALBANY, TX 

LOCATION. --Lat 32°42'27", long 99°16'29", Shackelford County, Hydrologic Unit 12060105, on downstream side of bridge on U.S. 
Highway 380, 1.7 mi (2.7 km) southeast of Albany, and 2.0 mi (3.2 km) upstream from Salt Prong Hubbard Creek. 

DRAINAGE AREA. --39. 3 mi 2 (101.8 km 2 ). 

PERIOD OF RECORD. — November 1962 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,340.54 ft (408.597 m) National Geodetic Vertical Datum of 1929. 

REMARKS. — No diversion above station. Rain gage located at station. 

MAXIMA: FOR AUGUST 1978. — Di scharge, 103,000 ft 3 /s (2,920 m 3 /s) Aug. 4, 1978, gage height, 23.3 ft (7.10 m). 

FOR PERIOD 1962 to July 1978. --Maximum discharge, 9,520 ft 3 /s (270 m 3 /s) May 5, 1969, gage height, 19.22 ft (5.858 m), from 

rating curve extended above 1,500 ft 3 /s (42.5 m 3 /s) on basis of slope-area measurement of 4,570 ft 3 /s (129 m 3 /s) and 

contracted-opening measurement of 9,520 ft 3 /s (270 m 3 /s). 
HISTORIC. --Flood information begins in 1940. Maximum flood since 1940, 23.3 ft (7.10 m) Aug. 4, 1978. Floods of June 10, 

1940, and July 18, 1953, reached stages of about 21 ft ^6.4 m), from information by local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1. . . 


.00 


2. .. 


.00 


3. . . 


6,760 


4... 


13,100 


5. .. 


67 


6. .. 


31 


7. . . 


15 



9. . 

10. 
11. 
12. 
13. 

14. 
15. 



7.4 


16. . 


6.6 


17.. 


5.6 


18.. 


8.3 


19.. 


6.2 


20. . 


4.1 


21.. 


3.1 


22.. 


2.2 


23.. 



1.9 


24.. 


2.0 


25.. 


1.9 


26. . 


1 .6 


27.. 


1.2 


28. . 


1 .2 


29.. 


1.2 


30.. 


1.2 


31.. 



1.2 

1.2 

1.1 

1.1 

1.1 
.97 
.97 

1.1 



MONTHLY MEAN DISCHARGE, IN CUBIC 


FEET PER SECOND 


646 


MONTHLY TOTAL ACRE-FEET 




39,700 


RUNOFF, IN INCHES 




18.97 





Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 

Date Hour . Ga9 L Discharge Date Hour J^H* Discharge Date Hour . G ?;?[L Discharge 
height height height 



Aug. 3 


- 1100 


1.95 


0.0 




1300 


2.74 


9.2 




1400 


2.93 


25 




1600 


2.98 


31 




1800 


3.18 


58 




1900 


6.60 


1,360 




2000 


12.00 


4,780 




2100 


19.60 


10,100 




2200 


22.70 


48,600 




2300 


23.05 


70,200 



0.00 Aug. 3 - 2400 22.80 53,600 



Aug. 4 



0100 


22 


55 


42,000 


0200 


23 


30 


103,000 


0300 


22 


70 


48,600 


0400 


21 


20 


13,000 


0500 


21 


10 


12,800 


0600 


22 


30 


30,700 


0700 


21 


50 


13,600 


0800 


16 


00 


7,460 



Aug. 4 - 1000 11.00 



Aug. 5 



4,080 



1100 


7.20 


1 ,670 


1200 


5.40 


816 


1300 


4.50 


456 


1800 


3.73 


207 


2400 


3.38 


115 


0600 


3.24 


82 


1200 


3 13 


63 


2400 


3.01 


42 



Period 



Highest mean discharge , in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1964 to July 1978- 



13,100 
1,570 



6,640 
754 



2,860 
361 



BRAZOS RIVER BASIN 



(19) 08086212 HUBBARD CREEK BELOW ALBANY, TX 



LOCATION. --Lat 32°43'58", long 99°08'25", Shackelford County, Hydrologic Unit 12060105, on left bank 0.5 mi (0.8 km) downstream from 
Salt Prong Hubbard Creek, 2.8 mi (4.5 km) upstream from Newcorb Creek, 4.5 mi (7.2 km) upstream from U.S. Highway 180, 9.1 mi 
(14.6 km) east of Albany, and 35.2 mi (56.6 km) upstream from nouth. Water-quality sampling site on left bank 0.5 mi (0.8 km) 
downstream. 



DRAINAGE AREA.--613 mi 2 (1, 



km 2 



PERIOD OF RECORD. —October 1966 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,184.99 ft (361.185 m) National Geodetic Vertical Datum of 1929. 
1968, water-stage recorder at site 2.1 mi (3.4 km) downstream at datum 7.63 ft (2.326 m) lower. 



Prior to June 12, 



MAXIMA: FOR AUGUST 1978. —Di sc harge, 330,000 ft 3 /s (9,350 m 3 /s) Aug. 4, 1978, gage height, 41.41 ft (12.622 m). 

FOR PERIOD 1966 to July 1978. --Maximum discharge, 27,200 ft 3 /s (770 m 3 /s) Jan. 21, 1968, gage height, 25.10 ft (7.650 m), 
at former site and datum, from rating curve extended above 150 ft 3 /s (4.25 m 3 /s) on basis of slope-area measurement of 
peak flow. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1... 


.00 


8. 


2... 


.00 


9. 


3.. . 


2,150 


10 


4.. . 


94,700 


11 


5. . . 


6,400 


12 


6. .. 


333 


13 


7... 


175 


14 
15 



98 


16. . 


64 


17.. 


91 


18.. 


64 


19.. 


52 


20. . 


36 


21.. 


27 


22. . 


20 


23.. 



17 


24. . 


14 


25.. 


12 


26. . 


10 


27.. 


8.5 


28.. 


7.2 


29.. 


6.6 


30. . 


6.1 


31.. 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER 


SECOND 


3,370 


MONTHLY TOTAL ACRE-FEET 




207 000 


RUNOFF, IN INCHES 




fi. 31 





Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour 



Gage 



height Dischar ^ ^ 



Hour height Discnar 9 e Date Hour height Dischar 9 e 



Auq. 


3 - 0400 


3.31 


0. 


00 Aug. 4 


- 0300 


39.89 


189,000 


Aug. 


5 


- 0600 


23.30 


14,400 




0600 


3.81 


3. 


8 


0400 


41.41 


330,000 






0800 


".8.00 


7,920 




1200 


4.04 


6 


9 


0430 


41.15 


300,000 






1000 


11.40 


2,970 




1300 


7.37 


681 




0500 


40.29 


218,000 






1200 


9.40 


1,840 




1500 


8.13 


1,020 




0600 


40.33 


221 ,000 






1800 


7.80 


942 




1800 


9.74 


1,980 




0700 


40.19 


210,000 






2400 


7.19 


657 




2100 


12.72 


3,760 




0730 


40.39 


226,000 














2200 


18.01 


7,890 




C800 


40.01 


196,000 


Aug. 


6 


- 1200 


6.52 


391 




2300 


23.88 


15,300 




1000 


38.11 


112,000 






2400 


6.04 


250 




2400 


30.17 


26,300 




1200 


35.72 


56,000 






















1500 


32.44 


33,700 


Aug. 


7 


- 1200 


5.65 


164 


Aug. 


4 - 0100 
0200 


35.79 
38.29 


56,700 
118,000 




1800 
2400 


29.94 
27.67 


25,900 
21 ,600 






2400 


5.40 


122 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1967 to July 1978- 



94,700 
20,100 



34,400 
14,600 



14,800 
6,670 



58- 



BRAZOS RIVER BASIN 

(20) 08086290 BIG SANDY CREEK ABOVE BRECKENRIDGE, TX 

LOCATION. --Lat 32°38'54", long 99°00' 15" , Stephens County, Hydrologic Unit 12060105, on left bank 600 ft (180 m) downstream from 
Battle Creek, 1.6 mi (2.6 km) upstream from bridge on Farm Road 576, 9.8 mi (15.8 km) southwest of Breckenridge, and about 14.6 
mi (23.5 km) upstream from Hubbard Creek Dam. 

DRAINAGE AREA.--280 mi 2 (725 km 3 ). 

PERIOD OF RECORD. --February 1962 to August 1978. Prior to October 1975, published as "near Breckenridge." 

GAGE. --water-stage recorder. Datum of gage is 1,185.83 ft (361.441 m) National Geodetic Vertical Datum of 1929. Prior to Oct. 1, 
1975, at site 1.6 mi (2.6 km) downstream at datum 7.41 ft (2.259 m) lower. 

REMARKS. — Flow is affected by Lake Cisco, capacity, 25,600 acre-ft (31.6 hm 3 ). 

MAXIMA: FOR AUGUST 1978. --Di scharge, 5,140 ft 3 /s (146 m J /s) Aug. 4, 1978, gage height, 21.86 ft (6.663 m). 

FOR PERIOD 1962 to July 1978.— Maximum discharge, 8,170 ft 3 /s (231 m 3 /s) May 13, 1965, gage height, 23.30 ft (7.102 m). 
HISTORIC. --According to information from State Highway Department, the floods of May 16, 1949, July 20, 1953, and Apr. 29, 
1957, each reached a stage of 24.6 ft (7.50 m). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1. . . 

2. .. 

3. . . 

4. .. 

5. .. 

6. .. 

7. . . 


.00 8... 

.55 9... 

2,710 10. . 

3,290 11.. 

334 12.. 

128 13.. 

40 14.. 

15.. 


18 16. . . 

9.5 17... 
4.2 18... 

1.6 19... 
.52 20... 
.21 21... 
.13 22... 
.09 23... 


07 24... .03 
06 25... .03 
06 26... .03 
04 27... .02 
04 28... .01 
04 29... .01 
04 30... .00 
03 31... .00 


MONTHLY MEAN DISCHARfiF. IN CUR IT. FFFT PFR SFCOND 


211 


MONT 
RUNO 


ILY TOTAL ACRE-FEET 




13,000 




.87 



Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date Hour ^2 t Discharge Date Hour plight Discharge Date Hour ^l t Discharge 



Aug. 3 - 



0100 


1.60 


41 


Aug. 3 


- 2400 


20.95 


4,760 


Aug. 4 - 2400 


6.40 


0200 


2.35 


124 














0300 


3.35 


253 


Aug. 4 


- 0500 


21.60 


5,030 


Aug. 5 - 0600 


5.10 


0500 


5.15 


550 




0700 


21.86 


5,140 


1200 


4.25 


0700 


8.75 


1,260 




0900 


21.55 


5,010 


2400 


3.09 


1000 


13.70 


2,430 




1400 


15.90 


3,010 






1600 


18.90 


3,940 




1800 


10.10 


1,560 


Aug. 6 - 1200 
2400 


2.35 
1.82 



788 

541 
394 
217 

124 
63 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1963 to July 1978- 



3,290 
5,610 



2,110 
4,720 



933 

2,380 



BRAZOS RIVER BASIN 

(21) 08086400 HUBRARD CREEK RESERVOIR NEAR BRECKENRIDGE, TX 

LOCATION. — Lat 32"49 ' 53" , long PS^'OS'', Stephens County Hydrologic Unit 12060105, on left bank just upstream from dam on Hubbard 
Creek, 1.4 mi (2.3 km) upstream from U.S. Highway 183, 6.5 mi (10.5 km) nort'iwest of Breckenridge, and 12.6 mi (20.3 km) upstream 
from mouth. 

DRAINAGE AREA. --1,085 mi 2 (2,810 km 2 ). 

PERIOD OE RECORD.— October 1962 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929. 

REMARKS. — The reservoir is formed by a rolled earthfill dam 5,630 ft (1,720 m) long. There are two additional levees, the north and 
south, making an overall length of 3.5 mi (5.6 km). Storage began September 1962 and the dam was completed in December 1962. 
The emergency spillway is a 2,000-foot-wide (610 m) cut through natural ground near the left end of dam. The .ervice spillway is 
a partially controlled morning-glory type with 12 lift gates designed to discharge 30,000 ft-/s (850 mVs) with a 17.5-foot (5.3 
m) head through a 22.0-foot-diameter (6.7 m) concrete conduit. The dam is the property of the West Central Texas Municipal Water 
District. The District has a permit to divert 56,000 acre-ft (69.0 hm-) annually for municipal, mining, and industrial uses. 
Diversions during the current year are as follows: 842 acre-ft (1.04 h.n 3 ) for municipal use, 3,870 acre-ft (4.77 hm^ ) for oil- 
field operation, and 1 250 acre-ft (1.54 hm-') for irrigation and domestic uses. Figures given herein represent total contents. 

Dat a regarding the dam and reservoir are given in the following table: 

Elevation Capacity 

(feet) (acre-feet) 

Top uf dam 1,208.0 

Crest of spillway 1,194.0 515,800 

Top of gates 1,185.1 350,900 

Top of conservation pool 1,183.0 317,800 

Crest of spillway 1,176.6 230,100 

Sill of gate , 1,138.0 5,580 

Lowest gated outlet (invert) 1,136.0 3,470 

MAXIMA: FOR AUGUST 1978.— Contents , 401,500 acre-ft (495 hm 3 ) Aug. 5, 1978, elevation, 1,188.06 ft (362.121 m). 

FOR PERIOD 1962 to July 1978. --Maximum contents, 327 200 acre-ft (403 hm') Feb. 3, 1975, elevation, 1,183.61 ft (360.764 
m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 2400 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1 


186,100 


8.. . 


339,300 


16. . 


303,800 


24... 


301 ,300 


2 


185,900 


9. . . 


323,500 


17. . 


303,100 


25. . . 


301 ,000 


3 


196,800 


10.. 


311 ,000 


18.. 


302,600 


26. .. 


300,700 


4 


399,000 


11. . 


305,600 


19. . 


301 ,700 


27. . 


300,300 


5 


389,300 


12.. 


305,300 


20.. 


302,200 


28... 


299,700 


6 


371 ,000 


13.. 


304,600 


21. . 


301 ,700 


29... 


299,100 


7 


355,400 


14.. 


304,100 


22. . 


301 ,900 


30. .. 


298,800 






15.. 


304,000 


23.. 


301 ,600 


31... 


298,700 


CHANGE I 


N CONTENTS, IN 


ACRE-F 


"ET 








1 1 2 500 















Elevation, in feet, and contents, in acre-feet, at indicated time, 1978 



Date 


Hour 


Eleva- 
tion 


Contents 


Date 


Hour 


Eleva- 
tion 


Contents 


Date 


Hour 


Eleva- 
tion 


Contents 


Aug. 3 


- 0400 


1172.72 


185,800 


Aug. 4 


- 1800 


1187.53 


392,100 


Aug. 6 


• 1200 


1186.84 


380,100 




1200 


1172.89 


187,600 




2400 


1187.92 


399,000 




2400 


1186.31 


371,000 




2400 


1173.74 


196,800 


























Aug. 5 


- 0400 


1188.02 


400,800 


Aug. 7 


- 1200 


1185.84 


363,100 


Aug. 4 


- 0300 


1174.47 


205,000 




0800 


1188.06 


401,500 




2400 


1185.37 


355,400 




0600 


1178.40 


252,800 




1200 


1187.94 


399,400 












0900 


1182.96 


317,200 




2400 


1187.37 


389,300 


Aug. 8 


- 1200 


1184.98 


348,900 




1200 


1185.60 


359,200 












2400 


1184.38 


339,300 



BRAZOS RIVER BASIN 

(22) 08086500 HUBBARD CREEK NEAR BRECKENRIDGE, TX 

LOCATION. --Lat 32°50'13", long 98°56'52", Stephens County, Hydrologic Unit 12060105, on downstream side of pier of bridge on U.S. 
Highway 183, 1.4 mi (2.3 km) downstream from Hubbard Creek Reservoir, 6.8 mi (10.9 km) northwest of Breckenridge, 8.2 mi (13.2 
km) upstream from Gonzales Creek, and 11.2 mi (18.0 km) upstream from Clear Fork Brazos River. 

DRAINAGE AREA. --1,089 mi 3 (2,821 km 3 ), of which 1,085 mi J (2,810 km 2 ) is above Hubbard Creek Dam. 

PERIOD OF RECORD. --April 1955 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,092.10 ft (332.872 m) National Geodetic Vertical Datum of 1929. Prior to July 16 
1959, at site 300 ft (91 m) upstream at same datum. 

REMARKS.— Flow is regulated by Hubbard Creek Reservoir (station 08086400). 

MAXIMA: FOR AUGUST 1978. -Discharge, 14,600 ft 3 /s (413 m 3 /s) Aug. 5, 1978, gage height, 30.66 ft (9.345 m). 

FOR PERIOD 1955 to July 1978. --Maximum discharge, 34,500 ft 3 /s (977 m 3 /s) May 26, 1957, gage height 34.00 ft (10 363 m) 
HISTORIC. --Maximum stage since at least 1925, 34.2 ft (10.42 m) July 20, 1953, from information by local resident and 
Texas Department of Highways and Public Transportation. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1... 




00 


8. . . 


9,250 


16.. 


2... 




00 


9. .. 


8,760 


17.. 


3... 




40 


10. . 


7,260 


18.. 


4. .. 


5,740 




11.. 


3,690 


19.. 


5. .. 


13,800 




12. . 


121 


20. . 


6... 


12,000 




13.. 


206 


21.. 


7. .. 


9,950 




14. . 


89 


22.. 








15.. 


3.3 


23.. 



2.3 


24. . 


1.5 


25. . 


1.6 


26. . 


.77 


27.. 


.91 


28.. 


1.3 


29.. 


1.3 


30. . 


.98 


31.. 



.89 

.3 

.83 

.64 

.92 

.52 

.35 

.32 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 




MONTHLY TOTAL ACRE-FEET 




■ 



Gage height, in feet, and discharge , in cubic feet 'per- second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge 



Aug. 4 



Aug. 5 



0100 


4.63 


11 


Aug. 


5 


- 1200 


30.62 


14,500 


Aug. 


9 - 


2400 


28.12 


7,990 


0400 


4.73 


14 






1800 


30.40 


14,000 












0700 


5.03 


27 






2400 


30.21 


13,000 


Aug. 


10- 


1200 


27.39 


7,280 


0900 


5.02 


26 
















2400 


26.46 


6,470 


1000 


12.74 


1,240 


Aug. 


6 


- 1200 


29.73 


12,000 












1100 


19.01 


3,180 






2400 


29.25 


10,800 


Aug. 


11- 


1200 


25.10 


5,400 


1200 


22.50 


4,760 
















1400 


19.77 


3,070 


1400 


25.99 


7,580 


Aug. 


7 


- 1200 


28.75 


9,990 






1600 


14.92 


1,630 


1800 


29.07 


11,700 






2400 


28.21 


8,910 






1800 


10.06 


655 


2400 


30.41 


14,000 
















1900 


7.88 


315 








Aug. 


8 


- 1200 


27.67 


8,250 






2000 


6.42 


122 


0400 


30.59 


14,400 






2400 


29.48 


9,850 






2100 


5.70 


60 


0800 


30.66 


14,600 
















2200 


5.33 


37 








Aug. 


9 


- 1200 


28.79 


8,680 






2400 


4.92 


18 



Period 



Highest mean discharge , in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1963 to July 1978- 



13,800 
4,910 



11,900 
4,270 



9,540 
3,330 



-61- 



BRAZOS RIVER BASIN 

(23) 08087300 CLEAR FORK BRAZOS RIVER AT ELIASVILLE, TX 

LOCATION. --Lat 32°57'36", long 98°45'59", Young County, Hydrologic Unit 12060104, on right bank 5 ft (2 m) upstream from old mill 
dam 180 ft (55 m) upstream from bridge on Farm Road 1974, 400 ft (122 m) northwest of U.S. Post Office at Eliasville, and 13.2 mi 
(21.2 km) upstream from mouth. 

DRAINAGE AREA. — 5,697 mi 2 (14,755 km 2 ). 

PERIOD OF RECORD. --November 1915 to April 1920, December 1923 to August 1925, July 1928 to September 1951, October 1961 to August 
1978. Monthly discharge only for some periods published in WSP 1312 as "near Crystal Falls". 

GAGE. --Water-stage recorder and concrete control. Datum of gage is 1,027.77 ft (313.264 m) National Geodetic Vertical Datum of 
1929. See WSP 1922 for history of changes prior to Dec. 18, 1961. 

REMARKS. — Many small diversions above station for municipal supply and oilfield operations. 

MAXIMA: FOR AUGUST 1978.— Di scharge, 68,000 ft 3 /s (1,930 m 3 /s) Aug. 6, 1978, gage height, 37.04 ft (11.290 m). 

FOR PERIOD 1915 to July 1978. --Maximum discharge, 35,800 ft 3 /s (1,010 m 3 /s) June 11, 1941, gage height, 33.45 ft (10.196 

m), site and datum then in use, from rating curve extended above 23,000 ft 3 /s (651 m 3 /s). 
HISTORIC. -Maximum stage since 1877, 37.04 ft (11.290 m) Aug. 5, 1978. Flood in May 1, 1957 reached a stage of 35 ft (11 

m), present site and datum; flood in September 1900 reached the same stage, from information by Texas Department of 

Highways and Public Transportation and local residents. Other floods are reported to have occurred in 1876, Apr. 27, 

1890, 1932, 1941, and 1955. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


.08 


8 


31 ,300 


16. . . 


707 


24. .. 




254 


2 


.08 


9 


21,900 


17... 


590 


25... 




227 


3 


.06 


10... 


13,000 


18... 


505 


26... 




217 


4 


4,180 


11... 


9,670 


19... 


441 


27... 




194 


5 


46,000 


12... 


3,220 


20. . . 


387 


28... 




166 


6 


55,200 


13... 


1,780 


21... 


327 


29... 




152 


7 


38,100 


14. .. 


1,310 


22... 


296 


30. . . 




145 






15... 


885 


23... 


270 


31... 




129 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 


IN CUBIC 


FEET PER SECOND. 








7 
459 


,470 


MONTHLY 








,000 

















Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge 



Aug. 4 



Aug. 5 



0030 


7.56 


0.04 


0500 


7.84 


.93 


0600 


7.98 


4.3 


0700 


8.25 


29 


0900 


8.72 


132 


1000 


9.10 


289 


1100 


10.25 


1,160 


1200 


11.29 


2,920 


1400 


12.40 


4,570 


1900 


16.90 


8,650 


2400 


24.19 


15,600 


0600 


31.70 


30,200 


1200 


35.44 


47,100 



Aug. 5 - 



Aug. 6 - 



Aug. 7 



1800 


36.63 


61,900 


Aug. 


8 - 


2400 


30.51 


27,500 


2400 


36.98 


67,100 


















Aug. 


9 - 


1200 


27.83 


21 ,900 


0100 


37.04 


68,000 






2400 


24.53 


16,100 


02C0 


36.93 


66,300 












0600 


36.71 


63,100 


Aug. 


10- 


1200 


22.01 


12,700 


1200 


36.08 


54,500 






2400 


20.37 


11,300 


1800 


35.48 


47,400 












2400 


34.92 


43,300 


Aug. 


11- 


1200 
2400 


18.22 
15.20 


9,630 
7,310 


1200 


34.05 


37,600 












2400 


33.24 


34,800 


Aug. 


12- 


0400 
1200 


12.28 
11.23 


4,420 
2,820 


1200 


32.10 


31,300 






2400 


10.83 


2,040 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1917 to July 1978- 



55,200 
32,400 



46,400 
23,200 



30,700 
16,600 



-62- 



BRAZOS RIVER BASIN 

(24) 08088000 BRAZOS RIVER NEAR SOUTH BEND, TX 

LOCATION. --Lat 33 o 01'27", long 98°38'37", Young County, Hydrologic Unit 12060201, on left bank 225 ft (69 m) downstream from bridge 
on State Highway 67, 1.8 mi (2.9 km) downstream from Clear Fork Brazos River, 2.0 mi (3.2 km) northeast of South Bend, and at 
mile 758.2 (1,219.9 km). 

DRAINAGE AREA. --22, 673 mi 2 (58,723 km 2 ), of which 9,566 mi 2 (24,776 km 2 ) probably is noncontributing. 

PERIOD OF RECORD. --September 1938 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,002.98 ft (305.708 m) National Geodetic Vertical Datum of 1929. Prior to Feb. 23, 
1939, nonrecording gage at site 225 ft (69 m) upstream. Feb. 23, 1939, to Mar. 9, 1969, water-stage recorder at site 225 ft (69 
m) upstream. 

REMARKS. --National Weather Service gage-height telemeter at station. 

MAXIMA: FOR AUGUST 1978.— Discharge, 78,100 ft 3 /s (2,210 mVs) at 1200 hours Aug. 6, 1978; maximum gage height, 41.50 ft (12.649 m) 

at 1800 hours Aug. 6, 1978. 
FOR PERIOD 1938 to July 1978. --Maximum discharge, 87,400 ft 3 /S (2,480 m 3 /s) May 4, 1941, gage height, 27.35 ft (8.336 m); 

maximum gage height, 32.70 ft (9.967 m) Aug. 29, 1957. 
HISTORIC. --Maximum stage since at least 1876, 41.50 ft (12.649 m) Aug. 6, 1978. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


1.2 


8. .. 


43,000 


16... 


1,490 


24. . . 




524 


2 


1.2 


9... 


29,700 


17. .. 


1 ,290 


25... 




472 


3 


3.2 


10.. 


18,200 


18... 


1,120 


26.. . 




450 


4 


1 ,460 


11. . 


11 ,200 


19... 


996 


27... 




379 


5 


29,500 


12.. 


4,210 


20... 


886 


28... 




295 


6 


74,700 


13.. 


2,600 


21... 


768 


29. .. 




259 


7 


61,000 


14.. 


2,260 


22. .. 


676 


30... 




235 






15.. 


1,780 


23. .. 


582 


31... 




223 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CU 


JIC FEET PER SECOND, 








9 
576 


360 


MONTHLY 








noo 


RUNOFF, 












48 



















Gage height, in feet, and discharge, in cubic fee't per second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date Hour 



Gage 
height 



Discharge Date Hour 



Gage 
height 



Discharge 



Aug. 4 - 



Aug. 5 



0200 


5.28 


9.5 


Aug. 6 


- 0800 


40.50 


76,300 


Aug. 


9 - 


1200 


28.92 


29,500 


1200 


5.47 


16 




1200 


41.20 


78,100 






2400 


26.14 


23,300 


1400 


5.45 


16 




1800 


41.50 


77,000 












1600 


8.76 


1,450 




2400 


41.12 


72,700 


Aug. 


10- 


1200 


23.17 


18,000 


1800 


10.88 


3,160 














2400 


20.67 


14,100 


2000 


12.20 


4,440 


Aug. 7 


- 1200 


39.05 


61,700 












2400 


14.10 


6,440 




2400 


36.40 


50,100 


Aug. 


11- 


1200 
2400 


18.83 
17.19 


11,300 
8,300 


0600 


18.19 


12,600 


Aug. 8 


- 1200 


33.90 


42,900 












1200 


23.76 


22,600 




2400 


31.46 


35,700 


Aug. 


12- 


1200 


12.40 


3,380 


1800 


31.06 


48,000 














2400 


10.73 


2,610 


2400 


36.91 


63,800 





















Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 — 

1940 to July 1978- 



74,700 
84,300 



59,600 
64,800 



38,200 
46,000 



-63- 



BRAZOS RIVER BASIN 

(25) 08088300 BRIAR CREEK NEAR GRAHAM, TX 

LOCATION. --Lat 33°12'43", long 98°37'06", Young County, Hydrologic Unit 12060201, near right bank on downstream side of bridge on 
Farm Road 1769, 3.7 mi (6.0 km) upstream from mouth, and 7.0 mi (11.3 km) northwest of Graham. 

DRAINAGE AREA. --24. 2 mi 2 (62.7 km 2 ). 

PERIOD OF RECORD. --April 1958 to August 1978. Prior to October 1965, published as Oak Creek near Graham. 

GAGE. — Water-stage" recorder. Altitude of gage is 1,090 ft (332 m), from topographic map. 

REMARKS. --No diversion above station. 

MAXIMA: FOR AUGUST 1978.— Discharge, 1.6 ft 3 /s (0.045 m 3 /s) Aug. 5, 1978, gage height, 0.78 ft (0.238 m). 

FOR PERIOD 1958 to July 1978. --Maximum discharge, 2,730 ft 3 /s (77.3 m 3 /s) Sept. 19, 1976, gage height, 12.31 ft (3.752 m). 
HISTORIC. --Maximum stage since at least 1900, 15.2 ft (4.63 m) in September 1955. Flood in May 1957 reached a stage of 
15.0 ft (4.57 m), from information by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



00 


8. 


00 


9. 


00 


10 


00 


11 


6 


12 


61 


13 


04 


14 




15 



.00 


16.. 


.00 


17.. 


1.4 


18.. 


1.1 


19.. 


.02 


20.. 


.00 


21.. 


.00 


22.. 


.00 


23.. 



.00 


24. . 


.00 


25.. 


.00 


26. . 


24 


27. . 


2.3 


28.. 


.46 


29.. 


.04 


30.. 


.00 


31.. 



.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND. 

MONTHLY TOTAL ACRE-FEET 

RUNOFF, IN INCHES 



1.02 
62.6 

.05 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1959 to July 1978- 



24 
1,190 



8.9 
877 



6.6 
380 



-64- 



BRAZOS RIVER BASIN 



(26) 08088400 LAKE GRAHAM NEAR GRAHAM, TX 

LOCATION. --Lat 33°08'04", long 98°36'48", Young County, Hydrologic Unit 12060201, near left end of earthen dam on Salt Creek, 2.2 mi 
(3.5 km) northwest of Graham, 5 mi (8 km) downstream from Briar Creek, and 9.5 mi (15.3 km) upstream from mouth. 

DRAINAGE AREA.--221 mi 2 (572 km 2 ). 

PERIOD OF RECORD. --March 1958 to September 1963 (unpublished record), October 1963 to August 1978. Prior to October 1965, monthend 
contents only. 

GAGE. --Water-stage recorder. Datum of gage (Salt Creek datum) is 1.30 ft (0.396 m) National Geodetic Vertical Datum of 1929. Prior 
to October 1963, nonrecording gage at same site and datum. 

REMARKS. --The lake is formed by a rolled earthfill dam 5,000 ft (1,500 m) long. Lake Graham was connected with Lake Eddleman in 
159 b," " 

property 
s 
of 

_. jev nf 1953. Fiourps aivpn herein renrespnt total cnntpnts. Data reaarriina thp 
a nd lake are given in the following t a ble: 

Gage height Capacity 

(feet) (acre-feet) 

Top of dam 1,092.0 

Crest of spillway 1,075.0 53,680 

Bottom of interconnecting channel 1,050.0 8,670 

Lowest gated outlet (invert) 1,050.0 8,670 

COOPERATION. --Capacity table was furnished by Freese, Nichols, and Endress, Consulting Engineers. Record of diversions furnished by 
tne city of Graham and Texas Electric Service Co. 

MAXIMA: FOR AUGUST 1978. --Contents, 36,090 acre-ft (44.5 hm 3 ) Aug. 5, 1978, gage height, 1,067.61 ft (325.408 m). 

FOR PERIOD 1958 to July 1978. --Maximum contents, 61,120 acre-ft (75.4 hm 3 ) Apr. 30, 1970, gage height, 1,077.77 ft (328.504 
m). 




CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 2400 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


I... 


35,200 


8. .. 


36,000 


16.. 


35,500 


24. .. 


35,090 


2. . . 


35,110 


9. . . 


35,960 


17.. 


35,370 


25. .. 


35,070 


3... 


35,440 


10. . 


35,940 


18.. 


35,300 


26... 


35,020 


4. . . 


35,540 


11.. 


35,890 


19.. 


35,300 


27.. 


34,910 


5. .. 


36,090 


12.. 


35,830 


20.. 


35,280 


28. . . 


34,800 


6. . . 


36,090 


13. . 


35,740 


21.. 


35,260 


29.. . 


34,760 


7. .. 


36,070 


14.. 


35,700 


22.. 


35,200 


30. . . 


34,720 






15. . 


35,610 


23. . 


35,130 


31... 


34,590 


CHAN( 


5E IN CONTENTS, IN 


ACRE-F 


ET 








-690 















-65- 



BRAZOS RIVER BASIN 

(27) 08088450 BIG CEDAR CREEK NEAR IVAN, TX 

LOCATION. --Lat 32°49'39", long 98°43'25", Stephens County, Hydrologic Unit 12060201, on left bank at downstream side of bridge on 
Farm Road 717, 3.2 mi (5.1 km) south of Ivan, 8.2 mi (13.2 km) northwest of Caddo, and 11.6 mi (18.7 km) northeast of Brecken- 
ridge. 

DRAINAGE AREA. --97. mi 2 (251.2 km 2 ). 

PERIOD OF RECORD. — December 1964 to August 1978. 

GAGE. --Water-stage recorder. Altitude of gage is 1,090 ft (332 m), from topographic map. 

REMARKS. --No regulation or diversion above station. 

MAXIMA: FOR AUGUST 1978.— Di scharge, 3.0 ft 3 /s (0.085 m 3 /s) Aug. 5, 1978, gage height, 4.11 ft (1.253). 

FOR PERIOD 1964 to July 1978. --Maximum discharge, 9,590 ft 3 /s (272 m 3 /s) July 8, 1968, gage height, 22.39 ft (6.824 m), 
from rating curve extended above 1,000 ft 3 /s (28.3 m 3 /s) on basis of slope-area measurement of 7,980 ft 3 /s (226 m 3 /s). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1975 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



00 


8. 


00 


9. 


00 


10 


00 


11 


88 


12 


81 


13 


25 


14 




15 



.10 


16. 


.02 


17. 


.02 


18. 


.02 


19. 


.02 


20. 


.02 


21. 


.03 


22. 


.02 


23. 



01 


24.. 


01 


25.. 


01 


26. . 


01 


27.. 


01 


28.. 


04 


29.. 


02 


30.. 


01 


31.. 



.01 
.01 
.02 
.02 
.02 
.03 
.04 
.04 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


.08 


MONTHLY TOTAL ACRE-FEET 


4.95 


RUNOFF, IN INCHES 


.nn 





Period 



Highest mean discharge , in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1966 to July 1978- 



0.9 
3,160 



0.6 
1,120 



0.3 
571 



-66- 



BRAZOS RIVER BASIN 

(28) 08088500 POSSUM KINGDOM RESERVOIR NEAR GRAFORD, TX 

LOCATION. --Lat 32°52'20", long 98°25'32", Palo Pinto County, Hydrologic Unit 12060201, at dam on Brazos River, 2.6 mi (4.2 km) 
upstream from Loving Creek, 11.3 mi (18.2 km) southwest of Graford, and at mile 687.5 (1,106.2 km). 

DRAINAGE AREA. --23, 596 mi 2 (61,114 km 2 ), approximately, of which 9,566 mi 2 (24,776 km 2 ) probably is noncontributing. 

PERIOD OF RECORD. --March 1941 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 0.10 ft (0.030 m) National Geodetic Vertical Datum of 1929 (levels by Brazos River 
Authority). Prior to Mar. 19, 1968, mercury U-tube in powerhouse at present site and datum. 

REMARKS. --The reservoir is formed by reinforced concrete dam, Ambursen-type, massive buttress with flat-slab deck, a controlled 
spillway, two bulkhead sections, and an earthen-dike section. Total length of dam is 2,740 ft (835 m) long. The dam was com- 
pleted and storage began Mar. 21, 1941. The spillway has nine roof-weir gates (modified bear-trap type) that are 73.66- by 13- 
foot (22.45 by 4 m) each and are designed to discharge about 100,000 ft 3 /s (2,830 m 3 /s) at a gage height of 1,000.0 ft (304.80 
m). The outlet works consist of one controlled 54- inch-diameter (1,372 mm) conduit. Water is used for power development, muni- 
cipal, industrial, irrigation, and recreational purposes. Two generators located in the powerhouse at dam can produce 22,500 
kilowatts at a 1,000 ft (305 m) gage height. Eleven major reservoirs, with a combined capacity of 607,800 acre-ft (749 hm 3 ), 
largely regulate the inflow. The capacity curve is based on recomputation of survey made in 1974. Figures given herein 

r ep resent total contents. Data re g a_r d i ng the dam and reservoir are given in the following table: 

Gage height Capacity 

(feet) (acre-feet) 

Top of dam .V 1,024.0 

Design flood (top of gates) 1,000.0 570,200 

Crest of spillway 987.0 383,300 

Invert of penstock 911.5 4,560 

Lowest gated outlet (invert) 874.8 

COOPERATION. --Capacity table 3-C furnished by Brazos River Authority. 

MAXIMA: FOR AUGUST 1978. --Contents, 564,800 acre-ft (696 hm 3 ) Aug. 12, 1978, gage height, 999.69 ft (304.706 m). 

FOR PERIOD 1941 to July 1978. --Maximum contents observed, 743,700 acre-ft (917 hm 3 ) Oct. 5, 1941, gage height, 1,001.0 ft 
(305.10 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 2400 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1 


465,900 


8. .. 


541 ,400 


16.. 


552,800 


24. .. 


553,900 


2 


465,800 


9. . . 


547,600 


17.. 


550,300 


25... 


554,600 


3 


468,600 


10.. 


549,600 


18.. 


548,300 


26... 


554,700 


4 


466,200 


11. . 


560,400 


19.. 


549,300 


27. . 


555,400 


5 


464,900 


12.. 


554,700 


20.. 


550,500 


28... 


555,300 


6 


493,800 


13.. 


556,100 


21.. 


551 ,000 


29. . . 


555,600 


7 


534,700 


14.. 


557,200 


22.. 


552,500 


30. .. 


555,600 






15. . 


555,400 


23.. 


553,400 


31 . . . 


555,300 


CHANGE 


IN CONTENTS, IN 


ACRE-F 


EET 








88,800 













-67- 



BRAZOS RIVER BASIN 

(29) 08089000 BRAZOS RIVER NEAR PALO PINTO, TX 

LOCATION. --Lat 32°51'45", long 98°18'08", Palo Pinto County, Hydrologic Unit 12060201, on right bank 100 ft (30 m) upstream from 
bridge on Farm Road 4, 300 ft (91 m) downstream from Dark Valley Creek, 6.5 mi (10.5 km) north of Palo Pinto, and at mile 667.3 
(1,073.7 km). 

DRAINAGE AREA. --23, 811 mi 2 (61,670 km 2 ), of which 9,566 mi 2 (24,776 km 2 ) probably is noncontributi ng. 

PERIOD OF RECORD. --January 1924 to August 1978. Monthly discharge only for some periods, published in WSP 1312. Published as 
"near Mineral Wells" 1924-33. 

GAGE. --Water-stage recorder. Datum of gage is 831.23 ft (253.359 m) National Geodetic Vertical Datum of 1929. Prior to Nov. 15, 
1933, nonrecording gage at site 19 mi (31 km) downstream at datum 38.19 ft (11.640 m) lower. 

REMARKS. --Si nee 1941, flow largely regulated by Possum Kingdom Reservoir (station 08088500) 20 mi (32 km) upstream. 

MAXIMA: FOR AUGUST 1978.— Discharge, 54,500 ft 3 /s (1,540 m J /s) Aug. 8, 1978, gage height, 22.93 ft (6.989 m). 

FOR PERIOD 1924 to July 1978. --Maximum discharge, 95,600 ft 3 /s (2,710 m 3 /s) June 16, 1930, at site 19 mi (31 km) downstream 

from Mineral Wells, gage height, 30 ft (9.1 m), present site and datum. 
HISTORIC. --Maximum stage occurred in 1876, from data by Corps of Engineers, and was several feet higher than the flood of 
June 16, 1930, which reached a stage of about 30 ft (9.1 m) and was the highest since 1876. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


7.8 


8. . . 


52,800 


16. . . 


3,000 


24. . . 




48 


2 


7.8 


9. .. 


39,900 


17... 


2,530 


25... 




46 


3 


54 


10. . 


30,000 


18.. . 


2,570 


26. . . 




43 


4 


62 


11 . . 


21,700 


19... 


921 


27... 




39 


5 


2,580 


12. . 


12,500 


20. .. 


123 


28... 




35 


6 


6,280 


13.. 


9,340 


21... 


73 


29. .. 




34 


7 


34,400 


14. . 


2,930 


22. . . 


62 


30. . . 




33 






15.. 


2,970 


23... 


55 


31 ... 




32 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 


IN CU 


3IC FEET PER SECOND, 








7 
447 


,260 


MONTHLY 








000 

















Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Gage 



Discharge Date Hour hp-jnht Discharge 



Auq. 


5 - 0100 


0.27 


47 




0200 


.95 


176 




0300 


3.40 


1,360 




0400 


4.22 


2,200 




0800 


4.69 


2,940 




1300 


4.78 


3,100 




2400 


4.74 


3,030 


Aug. 


6 - 0400 


4.73 


3,010 




1600 


4.74 


3,030 




1700 


4.89 


3,300 




1800 


6.36 


6,380 



Aug. 6 



Aug. 



Aug. 8 



2000 9.17 
2400 12.13 



7 - 1200 
1800 
2300 



15.05 
19.44 
21.23 



1200 22.51 
2400 22.93 



Aug. 9 - 1200 21.99 



13,600 
22,400 

31,000 
43,800 
49,200 

53,200 
54,500 

51,100 



Aug. 9 - 2400 

Aug. 10- 0400 
1600 
2400 



Aug. 11- 



1200 
1600 
1900 
2100 
2400 



15.72 

15.30 
15.61 
15.60 

14.66 

11.23 

8.23 

6.59 

5.44 



30,700 

29,300 
30,300 
30,300 

27,800 

17,400 

9,080 

5,170 

2,900 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1940 to July 1978- 



52,800 
81 ,700 



42,400 
76,700 



28,700 
62,700 



-68- 



BRAZOS RIVER RASH! 

(30) 08092600 PRAZOS RIVER AT WHITNEY HAM NEAR WHITNEY, TX 

LOCATION. --Lat 31°52'00", long 97°22'00' , Hill County, Hydrologic Unit 12060202, immediately helow Whitney Ham, 3.4 mi (5.5 km) 
upstream from gaging station near Whitney, 4.0 mi (6.4 km) upstream from Iron Creek, and 7.4 mi (11.9 km) southwest of Whitney. 

DRAINAGE AREA. --26, 190 mi 2 (67,830 km 2 ), of which 9,240 mi 2 (23,930 km 2 ) prohahly is noncontrihuting. 

PERIOD OF RECORD. --Chemical analysis: October 1947 to August 1978. 

REMARKS. --Records of discharge are available for qaging station 08093100, located 9.0 mi (14.5 km) downstream, for period October 
1938 to August 1978 in other reports of the Geological Survey. 

MAXIMA: FOR AUGUST 1978. --Maximum daily specific conductance, 3,620 micromhos Aug. 24. 

FOR PERIOD 1947 to July 1978.— Maximum daily specific conductance, 2,660 micromhos Oct. 1, 1948. 



(31) 08098290 BRAZOS RIVER NEAR HIGHP.ANK, TX 
(National stream-quality accounting network) 

LOCATION. --Lat 3r08'02", long 96 4D'29", Falls County, Hydrologic Unit 12070101, near right bank 45 ft (14 m) downstream from 
bridge on Farm Road 413, 1.4 mi (2.3 km) downstream from Highbank Slough and Spring Branch, 2.6 mi (4.2 km) south of Highhank, 
and at mile 346.6 (557.7 km). 

DRAINAGE AREA. --30, 436 mi' (78,829 km 2 ), of which 9,566 mi 2 (24,776 km 2 ) probably is noncontributi ng. 

PERIOD OF RECORD. --Chemical analysis: November 1967 to August 1978. Discharge records: October 1965 to August 1978. 

GAGE.— Water-stage recorder. Datum of gage is 279.29 ft (85.128 tn) National Geodetic Vertical Datum of 1929. 

REMARKS. --Many diversions for municipal supply, irrigation, and industrial uses above gage. Flow affected by 20 upstream reservoirs 
with a combined capacity of 4,181,000 acre-ft (5.16 km^). 

MAXIMA: FOR AUGUST 1978. --Maximum daily specific conductance, 3,000 micromhos Aug. 24. 

FOR PERIOD 1967 to July 1978.— Maximum daily specific conductance, 2,170 micromhos Dec. 8, 1972. 



-69- 



BRAZOS RIVER BASIN 

(32) 08099000 LEON RESERVOIR NEAR RANGER, TX 

LOCATION. --Lat 32°21 "46" , long 98°40'32", Eastland County, Hydrologic Unit 12070201, at outlet works near left end of dam on Leon 
River, 7.4 mi (11.9 km) south of Ranger, 8.7 mi (14.0 km) southeast of Eastland, and 274.1 mi (441.1 km) upstream from mouth. 

DRAINAGE AREA. --259 mi 2 (671 km 2 ). 

PERIOD OF RECORD. --January 1955 to August 1978. Prior to October 1965, monthend contents only. 

GAGE. — Nonrecording gage. Datum of gage is National Geodetic Vertical Datum of 1929. 

REMARKS. --The reservoir is formed by a rolled earthfill dam 3,700 ft (1,130 m) long. Storage began in April 1954 and dam was com- 
pleted in June 1954. The emergency spillway is a 1 ,200- foot -wide (366 m) cut through natural ground near the left end of dam. 
The service spillway is an uncontrolled circular concrete drop inlet designed for a maximum discharge of 5,000 ft 3 /s (142 m 3 /s) 
through an 11-foot-diameter (3 m) concrete conduit. The dam is the property of Eastland County Water Supply District and was 
built to impound water for municipal use by the cities of Ranger, Olden, and Eastland. The capacity table is based on a survey 
made in 1952. Figures given herein represent total contents. Data regarding the dam and reservoir are given in the following 

table: 

Elevation Capacity 

(feet) (acre-feet) 

Top of dam 1,398.0 

Crest of spillway 1,382.0 40,210 

Crest of spillway (top of conservation pool) 1,375.0 27,290 

Lowest gated outlet (invert for water supply) 1,335.0 869 

COOPERATION. — Elevation and diversion records furnished by Eastland County Water Supply District. 

MAXIMA (at 1000): FOR AUGUST 19 78. --Contents , 20,000 acre-ft (24.7 hm 3 ) Aug. 6-8, 1978, elevation, 1,369.80 ft (417.515 m). 

FOR PERIOD 1955 to July 1978. --Maximum contents observed, 40,640 acre-ft (50.1 hm 3 ) June 13, 1967, elevation, 
1,382.2 ft (421.29 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 1000 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1 . .. 


16,850 


8. . . 


20,000 


16. . 


19,640 


24. .. 


19,390 


2. .. 


16,850 


9. .. 


19,880 


17.. 


19,640 


25. . . 


19,390 


3. .. 


17,300 


10.. 


19,880 


18. . 


19,640 


26. .. 


19,390 


4. . . 


18,210 


11 . . 


19,880 


19.. 


19,510 


27. . 


19,270 


6. .. 


19,880 


12.. 


19,880 


20.. 


19,510 


28. .. 


19,270 


6. .. 


20,000 


13.. 


19,760 


21. . 


19,510 


29. . . 


19,270 


7. .. 


20,000 


14. . 


19,760 


22.. 


19,510 


30. . . 


19,270 






15. . 


19,760 


23. . 


19,390 


31... 


19,150 


CHAN 


11 IN CONTENTS, IN 


ACRE-F 


:et. . 








2,190 















-70- 



BRAZOS RIVER BASIN 

(33) 08099100 LEON RIVER NEAR DE LEON, TX 

LOCATION. --Lat 32°10'25", long 98°31'58", Comanche County, Hydrologic Unit 12070201, on left bank at downstream end of bridge on 
State Highway 16, 1.5 mi (2.4 km) upstream from Flat Creek, 4.4 mi (7.1 km) northeast of De Leon, 6 mi (10 km) downstream from 
Hog Creek, and 250.1 mi (402.4 km) upstream from mouth. 

DRAINAGE AREA. --479 mi 2 (1,241 km 2 )- 

PERIOD OF RECORD. --September 1960 to August 1978. 

GAGE. --water-stage recorder. Datum of gage is 1,209.93 ft (368.787 m) National Geodetic Vertical Datum of 1929. Prior to Nov. 22, 
1960, nonrecording gage at same site and datum. 

REMARKS. --Flow partly regulated by Leon Reservoir (station 08099000). Numerous diversions above station for municipal, steam power- 
plant operation, and other uses. Recording rain gage located at station. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 17 ft 3 /s (0.48 m 3 /s) Aug. 4, 1978, gage height, 2.47 ft (0.753 m). 

FOR PERIOD 1960 to July 1978. --Maximum discharge, 7,540 ft 3 /s (214 m 3 /s) Jan. 21, 1968, gage height, 15.50 ft (4.724 m). 
HISTORIC. --A stage of 19.3 ft (5.88 m) occurred in May 1908 at a point 2,000 ft (610 m) downstream from gage site and is 
the highest since that time, from information by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1.. 

2. . 

3. . 
4.. 
5. . 
6.. 
7. . 





.00 


8. 




.00 


9. 




.49 


10 


14 




11 


2 


.3 


12 




.00 


13 




.00 


14 
15 



.00 


16.. 


.00 


17.. 


.00 


18.. 


.00 


19.. 


.00 


20.. 


.00 


21.. 


.00 


22.. 


.00 


23.. 



.00 


24.. 


.00 


25.. 


.00 


26.. 


.00 


27.. 


.00 


28. . 


.00 


29.. 


.00 


30.. 


.00 


31.. 



.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


.54 


MONTHLY TOTAL ACRE-FEET 


3 3.3 





Period 



Highest mean discharge , in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1961 to July 1978- 



14 
6,970 



5.6 
6,420 



2.4 
4,100 



-71- 



BRAZOS RIVER BASIN 

(34) 08099300 SABAMA RIVER NEAR DE LEON, TX 

LOCATION -Lat 32°06'50", long 98°36'19", Comanche County, Hydrologic Unit 12070201, on left bank at downstream end of bridge on 
" Farm Road 587, 0.6 mi (1.0 km) downstream from Spring Branch, 4.0 mi (6.4 km) west of De Leon, 4.2 mi (6.8 km) upstream from 
Turkey Creek, and 12.2 mi (19.6 km) upstream from mouth. 

DRAINAGE AREA. --264 mi 2 (684 km 2 ). 

PERIOD OF RECORD. --September 1960 to August 1978. 

GAGE. -Water-stage recorder. Datum of gage is 1,209.59 ft (368.683 m) National Geodetic Vertical Datum of 1929. Prior to Nov. 
22, 1960, nonrecording gage at present site and datum. 

REMARKS. --Flow is affected by Nabors Lake (capacity unknown) on Spring Branch. Recording rain gage located at station. 

MAXIMA: FOR AUGUST 1978. -Discharge, 617 ft 3 /s (17.5 m 3 /s) Aug. 4, 1978, gage height, 8.80 ft (2.682 m). 

FOR PERIOD 1960 to July 1978. -Maximum discharge, 10,800 ft 3 /s (306 rnVs) June 12, 1967, gage height, 22.05 ft (6.721 m), 
HISTORIC. -Maximum stage since at least 1890, 24 ft (7.3 m) in May 1908, from information by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 




.00 


8 






.19 


16. .. 


.00 


24. .. 


.31 


2 




.00 


9 






.00 


17... 


.00 


25... 


.00 


3 




.00 


10... 






.00 


18... 


.00 


26. . . 


.00 


4 




333 


11... 






.00 


19... 


.00 


27... 


.00 


5 




36 


12. . . 






.00 


20... 


.00 


28... 


.00 


6 




9.1 


13... 






.00 


21... 


.00 


29. .. 


.00 


7 




2.2 


14... 






.00 


22. . . 


15 


30... 


.00 








15... 






.00 


23... 


4.8 


31... 


.00 


MONTHLY 


MEAN 
TOTAL 
IN IN 


DISCHARGE, 

ACRE-FEET 

CHES 


IN CUBIC 


FEET 


PER 


SECOND , 








12.9 


MONTHLY 








795 


RUNOFF 
















.06 























Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1961 to July 1978- 



333 
6,310 



126 
5,060 



54 
2,450 



BRAZOS RIVER BASIN 

(35) 08099400 PROCTOR LAKE NEAR PROCTOR, TX 

LOCATION. --Lat 31°58'07", long 98 9 29'09", Comanche County, Hydrologic Unit 12070201, in intake structure at Proctor Lake on Leon 
River, 2.0 mi (3.2 km) upstream from U.S. Highways 67 and 377, 3.5 mi (5.6 km) west of Proctor, and 228.1 mi (367.0 km) upstream 
from mouth. 

DRAINAGE AREA. --1,259 mi 2 (3,261 km 2 ). 

PERIOD OF RECORD. --January 1963 to August 1978. Prior to October 1970, published as Proctor Reservoir. 

GAGE. --Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929. Prior to May 28, 1963, nonrecording gage 
at same site and datum. 

REMARKS. --The lake is formed by a reinforced concrete gated structure and rolled earthfill section, total length 13,460 ft (4,103 
m). The lake was operated as a detention basin from Jan. 30 to July 5, 1963. The gates were closed July 6, 1963, but lake was 
operated to elevation 1,156.0 ft (352.35 m) until construction was completed. Deliberate impoundment began Sept. 30, 1963. The 
spillway is a gated concrete gravity structure located on the left bank, with an ogee weir section and stilling basin. The 
spillway is controlled by eleven 40.0- by 35.0-foot (12.2 by 10.7 m) tainter gates. The spillway was designed to discharge 
431,800 ft 3 /s (12,200 m 3 /s) at an elevation of 1,201.0 ft (366.06 m). The lake is operated for flood control and water conserva- 
tion. One major reservoir partly regulates the inflow (see station 08099000). Inflow is affected at times by discharge from the 
flood-detention pools of 21 f loodwater-retarding structures with combined detention capacity of 32,950 acre-ft (40.6 hm 3 ). These 
structures control runoff from 131 mi 2 (339 km 2 ) in the Leon River and Rush Creek watersheds. The capacity table is based on a 
survey made in 1946. Borrow is not included in capacity totals. Figures given herein represent total contents. Data regarding 

the dam and lake are given in the following table: 

Elevation Capacity 

(feet) (acre-feet) 

Top of dam 1,206.0 

Design flood 1,201.0 427,500 

Top of gates 1,197.0 374,200 

Crest of spillway (top of conservation pool) 1,162.0 59,400 

Lowest gated outlet (invert) 1,128.0 68 

COOPERATION. --Records furnished by Corps of Engineers and reviewed by Geological Survey. 

MAXIMA: FOR AUGUST 1978. --Contents, 31,170 acre-ft (38.4 hm 3 ) Aug. 4-7, 1978, elevation, 1,154.48 ft (351.886 m). 

FOR PERIOD 1963 to July 1978. --Maximum contents, 137,500 acre-ft (170 hm 3 ) Jan. 26, 1968, elevation, 1,174.84 ft (358.091 
m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 2400 



DAY 



CONTENTS 



DAY 



CONTENTS 



DAY 



CONTENTS 



DAY 



CONTENTS 



1... 


30,960 


2. . . 


30,850 


3. .. 


31 ,340 


4. . . 


31 ,170 


5. .. 


31 ,170 


6. . . 


31 ,170 


7. .. 


31 ,170 



9. 

10. 

11 

12 

13, 
14 
15, 



31 


110 


16 


31 


,050 


17 


30 


990 


18 


30 


,880 


19 


30 


,700 


20 


30 


,500 


21 


30 


,300 


22 


30 


,050 


23 



29,850 


24... 


28,710 


29,600 


25.. . 


28,550 


29,430 


26... 


28,410 


29,290 


27. . 


28,220 


29,210 


28... 


28,060 


29,070 


29. . . 


28,010 


28,960 


30... 


27,880 


28,850 


31... 


27,720 



CHANGE IN CONTENTS, IN ACRE-FEET. 



•3,510 



RRAZOS RIVER BASIN 

(36) 08109500 RRAZOS RIVER NEAR COLLEGE STATION, TX 

LOCATION. — Lat 30"32'33", long 96°25'21", Brazos County, Hydrologic Unit 12070101, at bridge on Farm Road 60, 6.5 mi (10.5 km) south 
of College Station, 9 mi (14 km) downstream from gaging station near Rryan, and at mile 271.9 (437.6 km). 

DRAINAGE AREA. --39,599 mi 2 (102,561 km 2 ), of which 9,566 mi 2 (24,776 km 2 ) prohaMy is noncontri^uti ng. 

PERIOD OF RECORD. --Chemical analysis: August 1961 to August 1978. 

REMARKS. --Records of discharge are available for gaging station 08109000, located 9 mi (14 km) upstream, for period June 1926 to 
August 1978 in other reports of the Geological Survey. 

MAXIMA: FOR AUGUST 1978. --Maximum daily specific conductance, 2,810 micromhos Aug. 27. 

FOR PERIOD 1961 to July 1978.— Maximum daily specific conductance, 2,030 micromhos Oct. 1, 1963. 



(37) 08114000 BRAZOS RIVER AT RICHMOND, TX 

LOCATION. --Lat 29°34'56", long 95°45'27", Fort Bend County, Hydrologic Unit 12070104, on right bank at downstream side of downstream 
bridge on U.S. Highway 59 in Richmond, 925 ft (282 m) downstream from Texas and New Orleans Railroad Co. bridge, and at mile 92.0 
(148.0 km). 

DRAINAGE AREA. --45, 007 mi 2 (116,568 km 2 ), approximately, of which 9,566 mi 2 (24,776 km 2 ) probably is noncontributi ng. 

PERIOD OF RECORD. --Chemical analysis: October 1945 to August 1978. Discharge records: October 1922 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 37.94 ft (11.564 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --Considerable water diverted above station for irrigation and municipal supply. 

MAXIMA: FOR AUGUST 1978. --Maximum daily specific conductance, 2,480 micromhos Aug. 30. 

FOR PERIOD 1945 to July 1978.— Maximum daily specific conductance, 2,540 micromhos Sept. 4, 1951. 



(38) 08116650 RRAZOS RIVER NEAR ROSHARON, TX 
(National stream-quality accounting network) 

LOCATION. --Lat 29°20'58", long 95"34'56", Fort Rend-Brazoria County line, Hydrologic Unit 12070104, on right bank at downstream 
side of bridge on Farm Road 1462, 2.0 mi (3.2 km) downstream from Big Creek, 2.1 mi (3.4 km) upstream from Cow Creek, 7.3 mi 
(11.7 km) west of Rosharon, and at mile 56.7 (91.2 km). 

DRAINAGE AREA. --45, 339 mi 2 (117,428 km 2 ), approximately, of which 9,566 mi 2 (24,776 km 2 ) probably is noncontributing. 

PERIOD OF RECORD. --Chemical analysis: October 1967 to August 1978. Discharge records: April 1967 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929. 

REMARKS. --Water diverted above station for irrigation, industrial, and municipal use. 

MAXIMA: FOR AUGUST 1978. --Maximum daily specific conductance, 2,400 micromhos Aug. 29, 30. 

FOR PERIOD 1967 to July 1978. --Maximum daily specific conductance, 4,430 micromhos Aug. 8, 1971. 



COLORADO RIVER BASIN 

(39) 08126500 COLORADO RIVER AT BALLINGER, TX 

LOCATION. --Lat 31°43'58", long 99°57'13", Runnels County, Hydrologic Unit 12090101, on left bank at downstream side of bridge on 
U.S. Highway 67 in Ballinger, 1.3 mi (2.1 km) upstream from Elm Creek, and at mile 660.2 (1,062.3 km). 

DRAINAGE AREA. --16, 840 mi 2 (43,620 km 2 ), approximately, of which 11,600 mi ! (30,040 km 2 ) probably is noncontributing. 

PERIOD OF RECORD. --June 1907 to August 1978. Monthly discharge only for some periods published in WSP 1312. Gage-height records 
collected in this vicinity from 1903-29 are contained in reports of the National Weather Service. 

GAGE. --Water-stage recorder. Datum of gage is 1,593.74 ft (485.772 m) National Geodetic Vertical Datum of 1929. Prior to Nov. 29, 
1930, nonrecording gages at several sites near present site at various datums. Nov. 29, 1930, to May 1, 1975, water-stage 
recorder at site 0.8 mi (1.3 km) downstream at same datum. 

REMARKS. --Di versions above station for irrigation, municipal supplies, and oilfield operation. Flow is affected by E. V. Spence and 
Oak Creek Reservoirs (see stations 08123950 and 08125500) and at times by discharge from the flood-detention pools of 25 
floodwater-retarding structures with a combined detention capacity of 26,640 acre-ft (32.8 hm 3 ). These structures control runoff 
from 133 mi 2 (344 km 2 ) in the Kickapoo and Valley Creeks drainage basins. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 16,600 ft 3 /s (470 m 3 /s) Aug. 3, 1978, gage height, 23.95 ft (7.300 m). 

FOR PERIOD 1907 to July 1978.— Maximum discharge, 75,400 ft 3 /s (2,140 m 3 /s) Sept. 18, 1936, gage height, 28.6 ft (8.72 m). 

HISTORIC. --Maximum stage since at least 1882, about 36 ft (11.0 m) sometime in 1884, at former site and datum, from infor- 
mation by local residents. Flood of Aug. 6, 1906, reached a stage of about 32.0 ft (9.75 m), at former site and datum, 
from floodmarks (backwater from Elm Creek). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 
DISCHARGE DAY DISCHARGE DAY DISCHARGE DAY 



DAY 



DISCHARGE 



1. . . 


.00 


8. 


2. .. 


3.3 


9. 


3. . . 


9,850 


10 


4. .. 


4,180 


11 


5. . . 


190 


12 


6. .. 


86 


13 


7. .. 


37 


14 
15 



23 


16 


18 


17 


16 


18 


16 


19 


28 


20 


15 


21 


12 


22 


9.8 


23 



9.6 


24 


9.1 


25 


8.3 


26 


7.6 


27 


7.5 


28 


7.2 


29 


7.1 


30 


6.9 


31 



7.1 
7.2 
6.8 
7.0 
7.4 
6.8 
6.9 
7.1 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND. 
MONTHLY TOTAL ACRE-FEET 



471 
29,000 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1968 to July 1978- 



9,850 
6,150 



4,740 
4,410 



2,050 
2,260 



-75- 



COLORADO RIVER BASIN 

(40) 08127000 ELM CREEK AT BALLINGER, TX 

LOCATION. --Lat 31°44'57", long 99°56'51", Runnels County, Hydrologic Unit 12090101, on right bank 1,000 ft (305 m) upstream from 
storage dam at Ballinger and 1.9 mi (3.1 km) upsream from mouth. 

DRAINAGE AREA.--471 mi 2 (1,220 km 2 ). 

PERIOD OF RECORD. --April 1932 to August 1978. 

GAGE. --Water-stage recorder and masonry dam control. Datum of gage is 1,617.72 ft (493.081 m) National Geodetic Vertical Datum of 
1929. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 23,400 ft 3 /s (663 m 3 /s) Aug. 3, 1978, gage height, 9.17 ft (2.795 m). 

FOR PERIOD 1932 to July 1978. --Maximum discharge, 50,000 ft 3 /s (1,420 m 3 /s) Oct. 13, 1957, gage height, 14.20 ft (4.328 m) 

from floodmark. 
HISTORIC. --Flood in August 1906 reached a stage of 14.5 ft (4.42 m), affected by backwater from Colorado River; highest 

stage not affected by backwater from Colorado River since at least 1904 was that of Oct. 13, 1957, from information by 

local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 
DAY DISCHARGE DAY DISCHARGE DAY DISCHARGE DAY 



DISCHARGE 



1. . . 


.00 


8. 


2. .. 


.00 


9. 


3... 


8,760 


10 


4. . . 


12,200 


11 


5. . . 


1,270 


12 


6. .. 


230 


13 


7. . . 


108 


14 
15 



71 


16 


58 


17 


49 


18 


41 


19 


32 


20 


25 


21 


20 


22 


16 


23 



13 


24 


11 


25 


9.2 


26 


7.2 


27 


4.7 


28 


3.3 


29 


2.5 


30 


1.9 


31 



1.8 

1.7 
1.6 
2.0 
1.9 
1.6 
1.1 



30 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND. 

MONTHLY TOTAL ACRE-FEET 

RUNOFF, IN INCHES 



740 
45,500 

1.81 



Gage height, in feet, and discharge, in cubie feet per second, at indicated time, 1978 



Date 



Hour 



Gage 



height Dischar ^ Date 



Hour height Dischar 9 e 



Date 



Hour height Dischar 9 e 



Aug. 3 



0500 


3.51 





0515 


4.37 


361 


0530 


4.76 


1,050 


0600 


5.06 


1,590 


0700 


5.52 


2,520 


1100 


5.80 


3,160 


1200 


6.79 


6,000 


1500 


7.86 


10,900 


1800 


8.48 


15,900 


2100 


8.95 


21,400 


2200 


9.17 


23,400 



0.00 Aug. 3 - 2300 



Aug. 4 



2300 


9.16 


23,300 


2400 


9.03 


22,200 


0300 


8.31 


14,300 


1200 


7.68 


9,700 


1300 


7.96 


11,600 


1500 


8.47 


15,800 


1545 


8.48 


15,900 


1700 


8.35 


14,600 


2100 


7.50 


8,760 


2400 


6.32 


4,540 



Aug. 5 



Aug. 6 



Aug. 7 



0300 
0800 
1400 
2400 


5.53 
4.92 
4.61 
4.37 


2,540 

1,320 

761 

361 


1200 
2400 


4.26 
4.19 


215 
141 


1200 

2400 


4.15 
4.11 


109 
83 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1933 to July 1978- 



12,200 
21,400 



7,410 
8,800 



3,240 
4,870 



-76- 



COLORADO RIVER BASIN 

(41) 08136500 CONCHO RIVER AT PAINT ROCK, TX 

LOCATION. --Lat 31°30'57", long 99°55'09", Concho County, Hydrologic Unit 12090105, near left bank on downstream end of pier of 
bridge on U.S. Highway 83, 0.5 mi (0.8 km) north of Concho County Courthouse in Paint Rock, 2.7 mi (4.3 km) downstream from 
Kickapoo Creek, and 19.6 mi (31.5 km) upstream from station. 

DRAINAGE AREA. — 6,415 mi* (16,615 km 2 ), of which 1,283 mi 2 (3,323 km 2 ) probably is noncontributi ng. 

PERIOD OF RECORD. --September 1915 to August 1978. Prior to October 1970, published as "near Paint Rock". 

GAGE.— Water-stage recorder with masonry dam control. Datum of gage is 1,574.36 ft (479.865 m) National Geodetic Vertical Datum of 
1929. See WSP 1922 for history of changes prior to Jan. 15, 1940. 

REMARKS. --Many diversions above station for irrigation and municipal supply. Flow is regulated by Twin Buttes Reservoir (station 
08131200) on the South Concho River and by 0. C. Fisher Lake (station 08134500) on the North Concho River. 

MAXIMA: FOR AUGUST 1978.— Discharge, 12,700 ft 3 /s (360 nrVs) Aug. 3, 1978, gage height, 19.11 ft (5.825 m). 

FOR PERIOD 1915 to July 1978. --Maximum discharge, 301,000 ft 3 /s (8,520 m 3 /s) Sept. 17, 1936, gage height, 43.4 ft (13.23 

m), from floodmarks, from rating curve extended above 98,000 ft 3 /s (2,780 m 3 /s) on basis of slope-area measurements of 

144,000 and 301,000 ft 3 /s (4,080 and 8,520 m 3 /s). 
HISTORIC. --Maximum stage since at least 1853, that of Sept. 17, 1936. Flood in August 1882 reached a stage of about 39.9 

ft (12.16 m), and flood in August 1906 reached a stage of 39.5 ft (12.04 m), from information by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1 


22 




8 




58 


16. . . 


28 


24. . . 


18 


2 


28 




9 




46 


17... 


27 


25... 


26 


3 


4,350 




10. .. 




39 


18. . . 


25 


26. . . 


27 


4 


1,750 




11... 




35 


19... 


23 


27... 


34 


5 


306 




12. . . 




53 


20. . . 


24 


28... 


36 


6 


143 




13... 




39 


21... 


23 


29... 


62 


7 


82 




14. .. 




35 


22. . . 


23 


30... 


52 








15... 




31 


23... 


21 


31... 


42 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 


IN CUBIC 


FEET 


PER SECOND. 








242 


MONTHLY 








14.900 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 — 

1962 to July 1978- 



4,350 
5,630 



2,140 
3,880 



962 

3,220 



-77- 



COLORADO RIVER BASIN 

(42) 08136700 COLORADO RIVER NEAR STACY, TX 
(National stream-quality accounting network) 

LOCATION.— Lat 31°29' 37" , long 99°34'25", Col eman-McCul loch County line, Hydrologic Unit 12090106, on left bank at downstream side 
of bridge on Farm Road 503, 1.2 mi (1.9 km) upstream from Bois d'Arc Creek, 1.8 mi (2.9 km) northeast of Stacy, 24 mi (39 km) 
downstream from Concho River, and at mile 604.8 (973.1 km). 



DRAINAGE AREA. --24, 040 mi 2 (62,260 km 2 ), approximately, of which 12, 



(33,360 km 2 ) probably is noncontributing. 



PERIOD OF RECORD. --March 1968 to August 1978. Prior to October 1970, published as "at Stacy". 

GAGE.— Water-stage recorder. Datum of gage is 1,394.66 ft (425.092 m) National Geodetic Vertical Datum of 1929 (Texas Department 
of Highways and Public Transportation bridge plans). 

REMARKS. --Many diversions above station for municipal, irrigation, and oilfield operation uses. Effluent from numerous sewage 
plants is returned to the river. Flow is affected by reservoirs upstream (see station 08126500) and at times by discharge from 
the flood-detention pools of 40 floodwater-retardi ng structures with a combined detention capacity of 54,040 acre-ft (66.6 hm 3 ). 
These structures control runoff from 260 mi 2 (673 km 2 ). 

MAXIMA: FOR AUGUST 1978.— Di scharge, 35,700 ft 3 /s (1,010 m 3 /s) Aug. 4, 1978, gage height, 22.50 ft (6.858 m). 

FOR PERIOD 1968 to July 1978.— Maximum discharge, 22,200 ft 3 /s (629 m 3 /s) Sept. 19, 1974, gage height, 16.68 ft (5.084 m). 
HISTORIC. --Maximum stage since since at least 1882, 356,000 ft 3 /s (10,100 m 3 /s) Sept. 18, 1936, gage height, 64.59 ft 

(19.687 m), by slope-area measurement of peak flow. The flood, of Sept. 18, 1936, was 4 ft (1.2 m) higher than the 1906 
flood and 7 to 8 ft (2.1 to 2.4 m) higher than the 1882 flood, from information by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


14 




8 




406 


16... 


120 


24. .. 




72 


2 


34 




9 




300 


17... 


106 


25... 




69 


3 


6,250 




10... 




239 


18... 


98 


26. .. 




64 


4 


28,000 




11 . .. 




196 


19... 


90 


27... 




58 


5 


7,540 




12... 




172 


20. . . 


86 


28. .. 




62 


6 


1 ,460 




13... 




155 


21... 


82 


29... 




75 


7 


625 




14. .. 




162 


22. .. 


78 


30... 




81 








15... 




138 


23... 


76 


31... 




97 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 


IN CUBIC 


FEET 


PER SECOND. 








1 
93 


,520 


MONTHLY 








,200 



















Period 



Highest mean discharge in cubic feet per second 
for the indicated number of consecutive days 
1 3 7 



August 1978 

1969 to July 1978- 



28,000 
14,400 



13,900 
7,330 



6,370 
4,480 



-78- 



COLORADO RIVER BASIN 

(43) 08138000 COLORADO RIVER AT WINCHELL, TX 

LOCATION. --Lat 31°28'04", long 99 o 09'43", McCul loch-Brown County line, Hydrologic Unit 12090106, near left bank on downstream 

end of pier of bridge on U.S. Highway 377, 0.3 mi (0.5 km) south of Winchell, 5.9 mi (9.5 km) downstream from Home Creek, and at 
mile 560.7 (902.2 km). 

DRAINAGE AREA. --24, 580 mi 2 (63,660 km 2 ), approximately, of which 12,880 mi 2 (33,360 km 2 ) probably is noncontributing. 

PERIOD OF RECORD.— November 1923 to September 1934 (published as "near Milburn"), January 1939 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,264.86 ft (385.529 m) National Geodetic Vertical Datum of 1929. November 1923 to 
September 1934, nonrecording gage at site 4.2 mi (6.8 km) downstream at datum 10.14 ft (3.091 m) lower. Jan. 13, 1939, to Mar. 
24, 1940, nonrecording gage at present site and datum. 

REMARKS. --Many diversions above station for irrigation, municipal supply, and oilfield operation. Flow is affected by reservoirs 
upstream (see station 08126500) and at times by discharge from f lood-dentention pools of 85 f loodwater-retarding structures with 
combined detention capacity of 100,320 acre-ft (124 hm 3 ). These structures control runoff from 486 mi 2 (1,259 km 2 ). 

MAXIMA: FOR AUGUST 1978.— Discharge, 29,600 ft 3 /s (838 m 3 /s) Aug. 5, 1978, gage height, 31.88 ft (9.717 m). 

FOR PERIOD 1923 to July 1978. --Maximum discharge, 76,100 ft 3 /s (2,160 m 3 /s) Oct. 15, 1930, gage height, 51.8 ft (15.79 m), 

present site and datum. 
HISTORIC. --Maximum stage since at least 1882, 62.2 ft (18.96 m) Sept. 19, 1936. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1. .. 




2. .. 


16 


3. . . 


1,060 


4. . . 


18,100 


5. . . 


19,500 


6. .. 


2,770 


7. . . 


1 ,020 



01 



621 


16.. 


422 


17.. 


389 


18.. 


336 


19.. 


163 


20.. 


131 


21.. 


108 


22.. 


105 


23.. 



94 


24.. 


77 


25.. 


63 


26. . 


55 


27. . 


49 


28. . 


45 


29. . 


42 


30. . 


39 


31.. 



36 
33 
32 
31 
31 
93 
77 
60 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


1470 


MONTHLY TOTAL ACRE -FEET 


qn ann 





Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive dai/s 

1 3 7 



August 1978 

1925 to July 1978- 



19,500 
67,000 



13,500 
55,100 



6,210 
33,600 



COLORADO RIVER BASIN 

(44) 08140600 LAKE CLYDE NEAR CLYDE, TX 

LOCATION. — Lat 32°19'05", long 99°28'43", Callahan County, Hydrologic Unit 12090107, at Clyde pump station, 0.6 mi (1.0 km) west of 
dam on North Prong Pecan Bayou, 2.1 mi (3.4 km) downstream from bridge on Farm Road 604, and 7.0 mi (11.3 km) southeast of Clyde. 

DRAINAGE AREA. --37. 9 mi J (98.2 km 2 ). 

PERIOD OF RECORD. --January 1970 to August 1978. 

GAGE.--Nonrecordi ng gage. Datum of gage is National Geodetic Vertical Datum of 1929. 

REMARKS. --The lake is formed by a rolled-fill earthen dam 3,950 ft (1,204 m) long. Appreciable storage began in April 1970, and the 
dam was completed in May 1970. The emergency spillways are two 200-foot -wide (61 m) cut channels through natural ground located 
at left end of dam. The service spillway is an uncontrolled 3.5- by 10.5-foot (1.1 by 3.2 m) reinforced concrete drop inlet that 
is connected to a 42-inch (1,067 mm) concrete outlet pipe. A 14-inch (356 mm) controlled drain pipe is connected to the drop 
inlet. There are four 4.83- by 3.50-foot (1.47 by 1.07 m) rectangular slots, two on each side, divided by a 10-inch (254 mm) 
con crete web. Figures given herein represent total contents. Data regarding the dam and lake are given in the following table: 

Elevation Capacity 

(feet) (acre-feet) 

Top of dam 1,888.9 16,530 

Crest of spillway 1,881.4 10,840 

Crest of spillway (invert of drop inlet) 1,872.0 5,720 

Lowest gated outlet (invert) 1,842.2 60 

COOPERATION. --Capacity table furnished by the Soil Conservation Service. 

MAXIMA (at 0900): FOR AUGUST 1978.— Contents, 7,420 acre-ft (9.15 hm 3 ) Aug. 4, 1978, elevation, 1,875.50 ft (571.652 m). 

FOR PERIOD 1970 to July 1978.— Maximum contents, 6,370 acre-ft (7.85 hm 3 ) May 28, 1975, elevation, 1,873.4 ft 
(571.01 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 0700 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1 


1 ,460 


8 


5,990 


16.. 


5,720 


24... 


5,760 


2 


1 ,460 


9 


5,900 


17.. 


5,670 


25... 


5,760 


3 


2,740 


10... 


5,860 


18.. 


5,670 


26. .. 


5,760 


4 


7,420 


11... 


5,810 


19.. 


5,670 


27.. 


5,720 


5 


6,660 


12... 


5,760 


20.. 


5,670 


28... 


5,720 


6 


6,320 


13. .. 


5,720 


21.. 


5,670 


29... 


5,720 


7 


6,230 


14... 


5,720 


22.. 


5,760 


30. .. 


5,720 






15. .. 


5,720 


23.. 


5,760 


31... 


5,720 


CHANGE 


IN CONTENTS, IN 


ACRE-FEET. . 










4,240 

















-80- 



COLORADO RIVER BASIN 

(45) 08140700 PECAN BAYOU NEAR CROSS CUT, TX 

LOCATION. --Lat 31°58'21", long 99 ? 07'48", Brown County, Hydrologic Unit 12090107, on right bank at downstream side of bridge 
on State Highway 279, 'l. 2 mi (1.9 km) downstream from Turkey Creek, and 4.2 mi (6.8 km) south of Cross Cut. 

DRAINAGE AREA. --532 mi 2 (1,378 km 2 ). 

PERIOD OF RECORD.— April 1968 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,453.35 ft (442.981 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --Several small diversions above station. Flow is affected at times by discharge from flood-detention pools of 32 

floodwater-retarding structures with combined detention capacity of 39,200 acre-ft (48.3 hm 3 ). These structures control runoff 

from 200 mi 2 (518 km 2 ) in the Turkey Creek and upper Pecan Bayou drainage basins. National Weather Service gage-height telemeter 
and rain gage at station. 

MAXIMA: FOR AUGUST 1978. --Discharge, 16,200 ft 3 /s (459 m 3 /s) Aug. 4, 1978, gage height, 24.90 ft (7.590 m). 

FOR PERIOD 1968 to July 1978.— Maximum discharge, 7,330 ft 3 /s (208 m 3 /s) Oct. 19, 1971, gage height, 19.68 ft (5.998 m). 
HISTORIC. --Flood in 1908 reached a stage of 26.5 ft (8.08 m) and was exceeded by a flood in 1900, from information by local 
resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


.00 


8 




1,020 


16... 


101 


24... 




8.6 


2 


79 


9 




899 


17... 


45 


25... 




6.3 


3 


3,840 


10... 




822 


18. .. 


27 


26... 




4.6 


4 


5,700 


11... 




741 


19... 


21 


27... 




3.6 


5 


6,160 


12... 




626 


20... 


18 


28... 




7.0 


6 


1,620 


13... 




390 


21... 


14 


29... 




18 


7 


1 ,210 


14. .. 




190 


22. . . 


14 


30. . . 




5.0 






15... 




134 


23... 


12 


31... 




2.7 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER SECOND. 








47 


766 


MONTHLY 








,100 


RUNOFF, 














1.66 





















Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour height Dischar 9 e Date Hour height Discnar 9 e Date Hour height Dl 'scharge 



Auq. 


2 - 1800 


1.36 







1830 


3.02 


135 




1930 


3.23 


184 




2000 


2.99 


129 




2200 


2.40 


35 




2230 


4.15 


534 




2300 


4.93 


905 




2400 


5.07 


977 


Auq. 


3 - 0300 


3.99 


466 




0400 


4.97 


925 




0500 


5.88 


1,380 




0700 


8.31 


2,310 



0.00 Aug. 3 - 0800 



Aug. 4 



0800 


8.59 


2,390 


1000 


8.24 


2,290 


1200 


11.57 


3,200 


1600 


17.31 


5,450 


2100 


20.37 


7,480 


2400 


19.42 


6,720 


0600 


13.68 


3,900 


1100 


9.21 


2,560 


1600 


14.61 


4,200 


2000 


20.60 


7,670 


2100 


22.85 


10,800 


2300 


24.66 


15,400 



Aug. 4 



Aug. 5 



Aug. 6 



2330 


24.90 


16,200 


2400 


24.83 


16,000 


0100 


24.81 


15,900 


0600 


22.14 


9,630 


0900 


18.02 


5,840 


1200 


12.75 


3,590 


1800 


7.71 


2,140 


2400 


7.18 


1,970 


1200 


6.32 


1,600 


2400 


5.79 


1,330 



Period 



August 1978 

1969 to July 1978- 



1 



Highest mean discharge, in cubic feet per second 
for the indicated number of consecutive days 

3 7 



6,160 
5,680 



5,230 
2,940 



2,920 

1,450 



-81- 



COLORADO RIVER BASIN 

(46) 08140800 JIM NED CREEK NEAR COLEMAN, TX 

LOCATION. --Lat 31°58'59", long 99°24'52", Coleman County, Hydrologic Unit 12090108, on right bank 77 ft (23 m) downstream from 

centerline of U.S. Highway 283, 1.4 mi (2.3 km) downstream from Turtle Bayou, 7.4 mi (11.9 km) downstream from Lake Coleman, and 
10.8 mi (17.4 km) north of Coleman. 

DRAINAGE AREA. --333 mi 2 (862 km 2 ), of which 299 mi 2 (774 km 2 ) is above Lake Coleman. 

PERIOD OF RECORD.— October 1961 to September 1964 (miscellaneous measurements only), March 1965 to August 1978. 

GAGE.— Water-stage recorder. Datum of gage is 1,592.31 ft (485.336 m) National Geodetic Vertical Datum of 1929. 

REMARKS.— Since March 1966 when deliberate impoundment began, flow has been largely controlled by Lake Coleman, capacity, 40,000 
acre-ft (49.3 hm 3 ) at service spillway; elevation, 1,717.5 ft (523.49 m). 

MAXIMA: FOR AUGUST 1978.— Discharge, 1,830 ft 3 /s (51.8 m 3 /s) Aug. 4, 1978, gage height, 5.77 ft (1.759 m). 

FOR PERIOD 1961 to July 1978. --Maximum discharge, 5,020 ft 3 /s (142 m 3 /s) May 6, 1969, gage height, 9.08 ft (2.768 m). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1. .. 


.00 


2. .. 


.00 


3... 


31 


4. .. 


967 


5. .. 


1,770 


6. .. 


1 ,740 


7. .. 


1 ,730 



540 


16... 


176 


24... 


23 


994 


17... 


144 


25. .. 


17 


719 


18. . . 


109 


26. . . 


12 


577 


19... 


82 


27... 


8.4 


469 


20. .. 


64 


28... 


5.6 


364 


21... 


49 


29... 


6.8 


278 


22. .. 


39 


30. .. 


6.1 


220 


23... 


31 


31. .. 


2.7 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


393 


MONTHLY TOTAL ACRE-FEET 


24 100 


RUNOFF, IN INCHES 


1 .36 





Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978-- 

1966 to July 1978- 



1,770 
3,000 



1,750 
2,420 



1,350 
1,680 



-82- 



COLORADO RIVER BASIN 



(47) 08141000 HORDS CREFK LAKE NEAR VALERA, TX 

LOCATION. — Lat 3r49'58", long 99°33'38", Coleman County, Hydrologic Unit 12090108, at. outlet-works structure near right end of dam 
on Hords Creek, 5.6 mi (9.0 km) north of Valera, and 8.8 mi (14.2 km) west of Coleman. 

DRAINAGE AREA. --48 mi 2 (124 km 2 ), approximately. 

PERIOD OF RECORD. --April 1948 to August 1978. Prior to Octoher 1970, published as Hords Creek Reservoir. 

GAGE. --Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929. 

REMARKS. --The lake is formed by a rolled earthfill dam 6,800 ft (2,070 n) long, including spillway. The deliberate impoundment of 
water began Apr. 7, 1948, and the dam was completed in June 1948. The emergency spillway is an excavated channel through natural 
ground, 500 ft (150 n) wide, located about 600 ft (180 m) from the right end of dam. The service spillway consists of three 
concrete conduits; two controlled by slide gates 5.0 by 6.0 ft (1.5 by 1.8 m), and the third an uncontrolled ogee spillway 4.0 ft 
(1.2 m) wide and 19.5 ft (5.9 m) high. The lake is operated for flood control and municipal water supply for the city of 
Coleman. The capacity table of August 1974 is based on a sedimentatieon survey made in 1968. Figures given herein represent 
t ot al contents. P at a .regard i ng the dam and lake ar e give n in the follow ing table : 



Elevation 
(feet) 



Top of dam 

Design fl ood 

Crest of spillway 

Crest of spillway (top of conservation pool). 
Lowest gated o utlet (Inve rt ) 



1,939.0 
1,933.6 
1,920.0 
1,900.0 
1,856.0 



Capacity 
(acre-feet) 



24,730 

8,110 

3 



COOPERATION. --Records furnished by Corps of Engineers and reviewed by Geological Survey. 



MAXIMA: 



FOR AUGUST 1978. --Contents , 3,570 acre-ft (4.40 hm 3 ) Aug. 5, 1978, elevation, 1,887.90 ft (575.432 m). 

FOR PERIOD 1948 to July 1978.— Maximum contents, 12,790 acre-ft (15.8 hm 3 ) May 1, 1956, elevation, 1,906.86 ft (581.211 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 2400 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1 . .. 


2,540 


8 


3,540 


16.. 


3,470 


24. .. 


3,410 


2... 


2,550 


9 


3,530 


17.. 


3,460 


25... 


3,400 


3. .. 


3,490 


10. .. 


3,520 


18.. 


3,460 


26... 


3,390 


4.. . 


3,550 


11... 


3,520 


19.. 


3,450 


27.. 


3,390 


5. . . 


3,570 


12... 


3,510 


20.. 


3,440 


28... 


3,380 


6. . . 


3,550 


13... 


3,500 


21.. 


3,430 


29.. . 


3,380 


7. .. 


3,550 


14... 


3,490 


22.. 


3,420 


30. .. 


3,370 






15... 


3,480 


2 3. . 


3,410 


31... 


3,360 


CHANI 


iE IN CONTENTS, IN 


ACRE-FEET . . 










820 















-83- 



COLORADO RIVER BASIN 

(48) 08141500 HORDS CREEK NEAR VAI rr-A, TX 

LOCATION. --Lat 31°50'03", long 99°32'04", Coleman County, Hydrologic Uni; 12090108, on left bank 2,500 ft (762 m) downstream from 
Farm Road 503, 1.6 mi (2.6 km) downstream from Hords Creek Dam, 5.7 mi (9.2 km) north of Valera, 7.0 mi (11.3 km) west of 
Coleman, and 21.8 mi (35.1 km) upstream from mouth. 

DRAINAGE AREA.— 53 mi 2 (137 km 2 ), approximately, of which 48 mi 2 (124 km 2 ) is above Hords Creek Dam. 

PERIOD OF RECORD. --April 1947 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,819.88 ft (554.699 m) National Geodetic Vertical Datum of 1929 (Corps of Engineers 
bench mark). 

REMARKS. --Flow regulated by Hords Creek Lake (station 08141000). 

MAXIMA: FOR AUGUST 1978.— Discharge, 2,360 ft 3 /s (66.8 m 3 /s) Aug. 3, 1978, gage height, 11.06 ft (3.371 m). 

FOR PERIOD 1947 to July 1978. --Maximum discharge, 3,860 ft 3 /s (109 m 3 /s) Apr. 30, 1956, gage height, 14.73 ft (4.490 m), 

fran rating curve extended above 1,900 ft 3 /s (53.8 m 3 /s). 
HISTORIC. --Maximum stage since at least 1900, 23.0 ft (7.01 m) July 3, 1932. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 




.00 


8 




32 


16. . . 


.00 


24. . . 




.00 


2 




.00 


9 




18 


17... 


.00 


25... 




.00 


3 




417 


10. . . 




9.1 


18... 


.00 


26... 




.00 


4 




169 


11... 




3.9 


19... 


.00 


27... 




.00 


5 




119 


12. .. 




1.2 


20... 


.00 


28... 




.00 


6 




83 


13... 




.12 


21... 


.00 


29. .. 




.00 


7 




54 


14... 




.00 


22. .. 


.00 


30. .. 




.00 








15... 




.00 


23... 


.00 


31... 




.00 


MONTHLY 


MEAN 


DISCHARGE, 


IN CUBIC 


FEET 


PER SECOND. 










29.2 


MONTHLY 


TOTAL 


ACRE-FEET 














1 


,800 



















Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive dans 

1 3 7 



August 1978 

1948 to July 1978- 



417 
864 



235 
469 



127 
385 



-84- 



COLORADO RIVER BASIN 

(49) 08143000 LAKE BROWNWOOD NEAR BROWNWOOO, TX 

LOCATION. --Lat 31°50'13", long 99°00'13", Brown County, Hydrologic Unit 12090107, at outlet structure for irrigation canal just up- 
stream from right end of dam on Pecan Bayou, 0.2 mi (0.4 km) downstream from Jim Ned Creek, 8 mi (13 km) north of Brownwood, and 
57.1 mi (91.9 km) upstream from mouth. 

DRAINAGE AREA. --1,535 mi 2 (3,976 km 2 ). 

PERIOD OF RECORD. --July 1933 to June 1934, April 1935 to September 1940, November 1944 to August 1978. Prior to October 1970, pub- 
lished as Brownwood Reservoir. 

GAGE.--Nonrecording gage read once daily. Datum of gage is 0.50 ft (0.152 m) below National Geodetic Vertical Datum of 1929. Prior 
to November 1944, nonrecording gages or water-stage recorder at various sites at dam at same datum. 

REMARKS. --The lake is formed by a rolled earthfill dam, 1,580 ft (482 m) long. The dam was completed in 1933 and deliberate im- 
poundment began in July 1933. Capacity table is based on 1959 survey. The uncontrolled spillway is a broad-crested weir 479 ft 
(146 m) long located 800 ft (240 m) to the left of dam. The controlled spillway consists of two 12-foot (4 m) horseshoe-shaped 
concrete conduits. Water is released into Brown County canal through a 5-foot (2 m) circular conduit that is controlled by a 
slide gate in a service structure located near the right end of dam. Water is used for irrigation and for municipal and indus- 
trial supply by the city of Brownwood (see station 08142500). Flow is affected at times by discharge from flood-detention pools 
of 59 floodwater-retardi ng structures with combined capacity of 73,310 acre-ft (90.4 hm 3 ). These structures control runoff from 
353 mi 2 (914 km 2 ) in the Jim Ned Creek and Pecan Bayou drainage basins. Figures given herein represent total contents. Data 

r eg arding the dam and lake are given in the following table: 

Gage height Capacity 

(feet) (acre-feet) 

Top of dam 1,450.0 - 

Crest of spillway 1,425.1 143,400 

Lowest gated outlet to irrigation canal (invert) 1,406.0 46,510 

Lowest gated outlet (invert) 1,330.0 ^_ 

COOPERATION. --Capacity table furnished by Corps of Engineers and Soil Conservation Service. 

MAXIMA (at 1800): FOR AUGUST 1978. --Contents , 138,500 acre-ft (171 hm 3 ) Aug. 16-24, 29, 30, 1978, gage height, 1,424.4 ft (434.16 
m). 
FOR PERIOD 1933 to July 1978. --Maximum contents, 192,300 acre-ft (237 hm 3 ) May 2, 1956, gage height, 1,431.4 ft 
(436.29 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 1800 



DAY 



CONTENTS 



DAY 



CONTENTS 



DAY 



CONTENTS 



DAY 



CONTENTS 



1 . . 

2. . 

3. . 

4. . 

5. . 

6. . 

7. . 



59,500 

59,120 

62,980 

79,880 

100,700 

110,300 

116,300 



9. . 
10. 
11. 
12. 
13. 
14. 
15. 



121 ,700 
126,600 
130,800 
132,900 
135,000 
137,100 
137,800 
137,800 



16. 
17. 
18. 
19. 
20. 
21. 
22. 
23. 



138 


500 


24. 


138 


500 


25. 


138 


500 


26. 


138 


500 


27. 


138 


500 


28. 


138 


500 


29. 


138 


500 


30. 


138 


500 


31. 



138,500 
137,800 
137,800 
137,800 
137,800 
138,500 
138,500 
138,500 



CHANGE IN CONTENTS, IN ACRE-FEET. 



79,000 



-85- 



COLORADO RIVER BASIN 

(50) 08143500 PECAN BAYOU AT BROWNWOOD, TX 

LOCATION --Lat 31°43'54" long WW 25", Brown County, Hydrologic Unit 12090107, on right bank at Brownwood, 502 ft (153 m) 
' upstream from city dam, 6.3 mi (10.1 km) downstream from Salt Creek, 10 mi (16 km) downstream from Lake Brownwood, and 47.5 mi 
(76.4 km) upstream from mouth. 

DRAINAGE AREA. --1,614 mi 2 (4,180 km 2 )- 

PERIOD OF RECORD. --May 1917 to June 1918, October 1923 to August 1978. 

GAGE. -Water-stage recorder. Datum of gage is 1,318.58 ft (401.903 m) National Geodetic Vertical Datum of 1929. See WSP 1922 for 
history of changes prior to Apr. 2, 1962. 

REMARKS. --Flow regulated by Lake Brownwood (station 08143000). Brown County Water Improvement District No. 1 canal (station 

08142500) diverts water from Lake Brownwood 10 mi (16 km) upstream. Flow from 20.8 mi 2 (53.9 km 2 ) above this station and below 
Lake Brownwood is partly controlled by nine fl oodwater-retardi ng structures with a combined detention capacity of 4,720 acre-ft 
(5.82 hm 3 ). National Weather Service gage-height telemeter at station. 



MAXIMA: 



FOR AUGUST 1978. -Di scharge, 47 ft 3 /s (1.33 m 3 /s) Aug. 4, 1978, gage height, 1.05 ft (0.320 m). 

FOR PERIOD 1923 to July 1978. -Maximum discharge, 31,600 ft 3 /s (895 m 3 /s) Oct. 14, 1930, gage height, 16.92 ft (5.157 m). 

HISTORIC --Maximum stage, 21.7 ft (6.61 m) in September 1900, from information by Gulf, Colorado, and Santa Fe Railway Co. 
Flood of July 3 1932, probably the greatest, reached a discharge of about 235,000 ft 3 /s (6,660 m 3 /s) as it entered Lake 
Brownwood (computed from rate of change of contents in lake; data furnished by engineers of Brown County Water Improve- 
ment District No. 1). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 




1.6 


16. . 


1.2 


17.. 


1.2 


18.. 


1.1 


19.. 


.93 


20.. 


.82 


21.. 


.77 


22.. 


.63 


23.. 



.54 


24.. 


.31 


25.. 


.19 


26.. 


.16 


27.. 


.10 


28.. 


.06 


29.. 


.06 


30.. 


,01 


31.. 



.00 
.00 
.00 
.00 
.00 
.00 
.00 
.00 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND. 
MONTHLY TOTAL ACRE-FEET 



1.36 
J3.7 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1934 to July 1978- 



21 
22,600 



10 
15,000 



5.2 
7,820 



-SI. 



COLORADO RIVER BASIN 

(51) 08143600 PECAN BAYOU NEAR MULLIN, TX 

LOCATION. --Lat 31°31'02", long 98°44'25", Mills County, Hydrologic Unit 12090107, on right bank 44 ft (13 m) downstream from bridge 
on Farm Road 573, 0.6 mi (1.0 km) downstream from Blanket Creek, 5.5 mi (8.8 km) southwest of Mullin, and 10 mi (16 km) upstream 
from Colorado River. « s _ 

DRAINAGE AREA.— 2,034 mi 2 (5,268 km 2 ). 

PERIOD OF RECORD. --October 1967 to August 1978. 

GAGE.— Water-stage recorder. Datum of gage is 1,202.93 ft (366.653 m) National Geodetic Vertical Datum of 1929. 

REMARKS.— Flow is affected by Lake Brownwood 47 mi (76 km) upstream (see station 08143000). Flow from 139 mi 2 (360 km 2 ) above this 
station and below Lake Brownwood is partly controlled by 38 floodwater-retarding structures with a combined detention capacity of 
30,690 acre-ft (37.8 hm 3 ) below the flood-spillway crests. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 1,690 ft 3 /s (47.9 m 3 /s) Aug. 3, 1978, gage height, 6.50 ft (1.981 m). 

FOR PERIOD 1967 to July 1978.— Maximum discharge, 13,700 ft 3 /s (388 m 3 /s) Jan. 23, 1968, gage height, 29.26 ft (8.918 m). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 




.00 


8 




7.4 


16. .. 


1.4 


24. .. 




8.5 


2 




.00 


9 




5.4 


17. .. 


1.2 


25... 




7.0 


3 




958 


10... 




4.0 


18... 


1.1 


26. .. 




5.3 


4 




225 


11... 




3.7 


19... 


1.1 


27... 




4.5 


5 




72 


12... 




3.0 


20... 


1.2 


28... 




3.8 


6 




32 


13... 




2.1 


21... 


1.3 


29... 




26 


7 




14 


14. .. 




1.6 


22... 


22 


30. .. 




23 








15... 




1.4 


23... 


6.0 


31... 




4.8 


MONTHLY 


MEAN 
TOTAL 


DISCHARGE, 
ACRE-FEET 


IN CUBIC 


FEET 


PER SECOND. 








2 


46.7 


MONTHLY 








,870 



















Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1968 to July 1978- 



958 
12,700 



418 
1 1 ,000 



7,450 



-87- 



COLORADO RIVER BASIN 

(52) 08144500 SAN SABA RIVER AT MENARD, TX 

LOCATION — Lat 30°55'08" long 99°47'07", Menard County, Hydrologic Unit 12090109, on downstream side of bridge on U.S. Highway 
83 in*Menard, 1.1 mi (1.8 km) downstream from Las Moras Creek, 1.9 mi (3.1 km) upstream from Volkmann Draw, and 110.4 mi (177.6 
km) upstream from mouth. 

DRAINAGE AREA. --1,151 mi 2 (2,981 km 2 ). 

PERIOD OF RECORD. --September 1915 to August 1978. 

GAGE -Water-stage recorder. Datum of gage is 1,863.05 ft (567.858 m) National Geodetic Vertical Datum of 1929. Sept. 14, 1915 
to Mar. 12 1924, nonrecording gage at site 635 ft (194 m) downstream at datum 2.20 ft (0,671 m) lower. Mar. 13, 1924, to Feb. 
21 1939 nonrecording gage at site 1,000 ft (305 m) upstream at datum 2.00 ft (0.610 m) higher. Feb. 22, 1939, to Jan. 25, 1940 
nonrecording gage at present site and datum. Jan. 26, 1940, to Sept. 19, 1957, water-stage recorder at site 240 ft (73 m) to 
right at present datum. Feb. 8, 1962, to Jan. 22, 1963, nonrecording gage at site 600 ft (180 m) downstream at present datum. 

REMARKS --Since about 1890, low flow duringf irrigation season regulated by diversions to Noyes Canal 4.5 mi (7.2 km) upstream 
and diversions by pumping at several locations upstream. Records of the Texas Water Rights Commission show permits have been 
granted to irrigate 3,338 acres (1,400 hm 2 ) above station. 

MAXIMA: FOR AUGUST 1978. -Di scharge, 35,400 ft 3 /s (1,000 m 3 /s) Aug. 2, 1978, gage height, 17.36 ft (5.291 m). 

FOR PERIOD 1915 to July 1978.— Maximum discharge, 130,000 ft 3 /s (3,680 m 3 /s) July 23, 1938, gage height, 22.2 ft (6.77 m), 
present site and datum, from floodmark, from rating curve extended above 56,000 ft 3 /s (1,590 m 3 /s) on basis of 
slope-area measurement of peak flow. . 

HISTORIC. --Maximum stage since at least 1880, 23.3 ft (7.10 m) June 6, 1899, present site and datum, from information by 
local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


25 




8 




97 


16. . . 


54 


24... 




33 


2 


5,240 




9 




97 


17... 


49 


25. .. 




38 


3 


5,460 




10... 




87 


18... 


46 


26... 




38 


4 


315 




11... 




82 


19... 


42 


27... 




40 


5 


151 




12... 




210 


20. .. 


40 


28... 




44 


6 


113 




13... 




250 


21... 


39 


29. .. 




51 


7 


103 




14... 




111 


22. . . 


41 


30... 




47 








15... 




76 


23... 


36 


31... 




45 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER SECOND. 








26 


423 


MONTHLY 








,000 


RUNOFF, 














.42 























Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour n giqht Discharge Date Hour ^l^ t Discharge Date 



Hour 



Gage 
height 



Discharge 



Aug. 2 



0500 


3.63 


26 


1745 


3.83 


44 


1800 


8.06 


2,240 


1845 


9.16 


3,780 


1900 


10.41 


5,870 


1930 


12.58 


10,500 


2000 


13.69 


14,200 


2200 


16.57 


29,700 


2230 


17.14 


33,700 


2300 


17.36 


35,400 



Aug. 2 



Aug. 3 



2330 


17.09 


33,300 


Aug. 


3 


- 1300 


7.42 


1,840 


2400 


16.34 


28,100 






1700 
2400 


6.61 
5.96 


958 
526 


0100 


14.43 


17,400 












0300 


12.48 


11,100 


Aug. 


4 


- 1200 


5.45 


304 


0500 


12.89 


12,200 






2400 


5.08 


190 


0600 


12.37 


10,900 












0900 


9.39 


5,470 


Aug. 


5 


- 1200 


4.89 


147 


1100 


8.23 


3,210 






2400 


4.77 


124 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1917 to July 1978- 



5,460 
53,300 



3,670 
41 ,200 



1 ,640 
22,400 



-88- 



COLORADO RIVER BASIN 

(53) 08144800 BRADY CREEK NEAR EDEN, TX 

LOCATION. --Lat 31°H'05", long 99°50'29", Concho County, Hydrologic Unit 12090110, on right bank at upstream side of bridge on 
U.S. Highway 83, 0.8 mi (1.3 km) downstream from Fitzgerald Creek, 2.2 mi (3.5 km) south of Eden, 2.4 mi (3.9 km) upstream from 
Hardin Branch, and 69.3 mi (111. & km) upstream from mouth. 

DRAINAGE AREA.— 97 mi 2 (251 km 2 ). 

PERIOD OF RECORD. --April 1962 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 2,000.99 ft (609.902 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --Flow is affected at times by discharge from the flood-detention pools of five floodwater-retarding structures with com- 
bined detention capacity of 22,190 acre-ft (27.4 hm 3 ). These structures control runoff from 65.0 mi 2 (168.4 km 2 ) above this 
station. 

MAXIMA: FOR AUGUST 1978.— Discharge, 2.1 ft 3 /s (0.059 m 3 /s) Aug. 3, 1978, gage height, 1.30 ft (0.396 m). 

FOR PERIOD 1962 to July 1978. --Maximum discharge, 5,110 ft 3 /s (145 m 3 /s) Apr. 28, 1966, gage height, 7.08 ft (2.158 m). 
HISTORIC. --Maximum stage since at least 1884, 15.8 ft (4.82 m) in July 1938, from information by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1 




.16 


8 




.71 


16... 


.19 


24... 


.18 


2 




.73 


9 




.57 


17... 


.15 


25... 


.17 


3 




1.7 


10... 




.53 


18... 


.19 


26... 


.21 


4 




1.0 


11... 




.42 


19... 


.19 


27... 


.22 


5 




.71 


12... 




.47 


20... 


.23 


28. .. 


.22 


6 




.98 


13... 




.51 


21... 


.18 


29... 


.22 


7 




.93 


14... 




.36 


22... 


.16 


30... 


.17 








15... 




.35 


23... 


.17 


31... 


.13 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 


IN CUBIC 


FEET PER 


SECOND 








.42 


MONTHLY 








26 .0 


RUNOFF, 














.01 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1963 to July 1978- 



1.7 
485 



1 .1 
254 



1.0 
111 



-89- 



COLORADO RIVER BASIN 

(54) 08144900 BRADY CREEK RESERVOIR NEAR BRADY, TX 

LOCATION. — Lat 31°08'17", long 99°23'07", McCulloch County, Hydro! ogic Unit 12090110, at mouth of Bear Creek on Brady Creek, 280 ft 
(85 m) upstream from Farm Road 3022 over Brady Creek Dam, 3.0 mi (4.8 km) west of Brady, and 34.1 mi (54.9 km) upstream from 
mouth. 

DRAINAGE AREA.--513 mi 2 (1,329 km 2 ). 

PERIOD OF RECORD. --May 1963 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929. 

REMARKS. --The reservoir is formed by a compacted earthfill dam 8,400 ft (2,560 m) long. The dam was completed and storage began in 
May 1963. The dam was built by the city of Brady in cooperation with the Soil Conservation Service and the Farmers Home Adminis- 
tration for flood control, municipal, and industrial water supply. The spillway is a cut channel through natural ground 1,000 ft 
(305 m) wide located at right end of dam. The top of conservation pool is an uncontrolled concrete drop-inlet structure that 
discharges through a 7.0- by 7.0-foot (2.1 by 2.1 m) concrete box conduit and is designed to discharge 4,000 ft 3 /s (113 m 3 /s) at 
a 19.4-foot (5.9 m) head. The gated outlet is a 36-inch (915 mm) pipe that extends through the embankment and is equipped with 
three sluice gates for controlled releases downstream. Flow into reservoir is affected at times by discharge from the flood- 
detention pools of 35 floodwater-retarding structures with combined detention capacity of 82,180 acre-ft (101 hm 3 ). These struc- 
tures were built during the period February 1955 to July 1962 and control runoff from 263 mi 2 (681 km 2 ) in the Brady Creek water- 
shed above this station. Capacity curve is based on Geological Survey topographic map (1960 edition) and was not adjusted for 
bor row. Figures given herein represent total contents. Data regarding the dam and reservoir are given in the following table: 

Elevation Capacity 

(feet) (acre-feet) 

Top of dam 1,783.0 - 

Crest of spillway ;. 1,762.4 90,310 

Crest of spillway (top of conservation pool) 1,743.0 30,430 

Lowest gated outlet (invert) 1,712.0 1,320 

COOPERATION. --Capacity curve furnished by the city of Brady. 

MAXIMA: FOR AUGUST 1978.— Contents, 21,570 acre-ft (26.6 hm 3 ) Aug. 3, 1978, elevation, 1,738.12 ft (529.779 m). 

FOR PERIOD 1963 to July 1978.— Maximum contents, 40,880 acre-ft (50.4 hm 3 ) Sept. 24, 1971, elevation, 1,747.70 ft (532.669 

m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 2400' 



DAY 



CONTENTS 



DAY 



CONTENTS 



DAY 



CONTENTS 



DAY 



CONTENTS 



1 . .. 


19,970 


8. 


2. . . 


21 ,180 


9. 


3. .. 


21 ,570 


10 


4.. . 


21 ,570 


11 


5. .. 


21 ,540 


12 


6. .. 


21 ,550 


13 


7. .. 


21 ,540 


14 
15 



21 


,500 


16 


21 


,490 


17 


21 


,450 


18 


21 


,440 


19 


21 


,400 


20 


21 


,350 


21 


21 


,320 


22 


21 


,280 


23 



21 ,230 


24. .. 


20,950 


21 ,180 


25.. . 


20,920 


21 ,150 


26. . . 


20,870 


21 ,120 


27. . 


20,840 


21 ,090 


28... 


20,780 


21 ,040 


29... 


20,810 


21 ,010 


30. .. 


20,790 


20,980 


31... 


20,790 



CHANGE IN CONTENTS, IN ACRE-FEET. 



810 



COLORADO RIVER BASIN 

(55) 08145000 BRADY CREEK AT BRADY, TX 

LOCATION. --Lat 31°08'17", long 99°20'05", McCulloch County, Hydrologic Unit 12090110, on left bank just upstream from bridge 
on U.S. Highway 377 on North Bridge Street in Brady, 0.4 mi (0.6 km) downstream from Live Oak Creek, and 29.5 mi (47.5 km) 
upstream from mouth. 

DRAINAGE AREA. --575 mi 2 (1,489 km J ). 

PERIOD OF RECORD. --May 1939 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,646.50 ft (501.853 m) National Geodetic Vertical Datum of 1929. Prior to July 9, 
1940, nonrecording gage at site 3,600 ft (1,100 m) upstream at datum 8.24 ft (2.512 m) higher. 

REMARKS. — The city of Brady, which obtains its water supply from ground-water sources, reported that 505 acre-ft (623,000 m 3 ) of 
sewage effluent was returned to Brady Creek downstream from the gage during the current year. Flow largely controled since May 
22, 1962, by Brady Creek Reservoir (station 08144900). Flow from 24.2 mi 1 (62.7 km') above this station and below Brady Creek 
Reservoir is partly controlled by six f loodwater-retarding structures with a combined capacity of 6,440 acre-ft (7.94 hm 3 ) below 
flood-spillway crests. 

MAXIMA: FOR AUGUST 1978. --Discharge, 536 ft 3 /s (15.2 m 3 /s) Aug. 2, 1978, gage height, 8.31 ft (2.533 m). 

FOR PERIOD 1939 to July 1978. --Maximum discharge, 39,100 ft 3 /s (1,110 m 3 /s) Sept. 10, 1952, gage height, 24.80 ft (7.559 

m). 
HISTORIC. --Maximum stage since at least 1882, 29.1 ft (8.87 m) July 23, 1938, present site and datum, discharge at site 

5 mi (8 km) downstream, 86,000 ft 3 /s (2,440 m 3 /s) by slope-area measurement. Flood of Oct. 6, 1930 (second highest 

since 1882), reached a stage of 25.9 ft (7.89 m), discharge 50,300 ft 3 /s (1,420 m 3 /s), present site and datum, from 

information by local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1. . . 


.00 


8. 


2. .. 


153 


9. 


3... 


261 


10 


4. .. 


36 


11 


5. .. 


16 


12 


6. .. 


5.8 


13 


7 ... 


2.8 


14 
15 



2 


16.. 


53 


17.. 


29 


18.. 


18 


19.. 


13 


20. . 


10 


21.. 


07 


22.. 


05 


23.. 



.04 


24. . 


.03 


25. . 


.02 


26. . 


.02 


27.. 


.02 


28. . 


.02 


29.. 


.02 


30.. 


.02 


31.. 



.02 

.02 

.02 

.01 

.34 

.5 

.35 

.12 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


15.5 


MONTHLY TOTAL ACRE-FEET 







Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1940 to July 1978- 



261 
21,100 



150 
9,450 



4,160 



-91- 



COLORADO RIVER BASIN 

(56) 08146000 SAN SABA RIVER AT SAN SABA, TX 

LOCATION. — Lat 31°12'47", long 98°43'09", San Saba County County, Hydrologic Unit 12090109, on right bank at downstream side of 
bridge on State Highway 16, 1.2 mi (1.9 km) north of San Saba, 2.7 mi (4.3 km) upstream from Mill Creek, 4.8 mi (7.7 km) 
downstream from China Creek, and 16.6 mi (26.7 km) upstream form mouth. 

DRAINAGE AREA. --3, 042 mi 2 (7,879 km 2 ). 

PERIOD OF RECORD. --December 1904 to December 1906 (gage heights only), September 1915 to August 1978. Published as "near San Saba" 
December 1904 to December 1906 and September 1915 to August 1930. 

GAGE. --Water-stage recorder. Datum of gage is 1,162.16 ft (354.226 m) National Geodetic Vertical Datum of 1929. See WSP 1922 for 
history of changes prior to July 8, 1953. Since Oct. 1, 1956, supplementary water-stage recorder 2,780 ft (847 m) to right of 
main-channel gage used for floodflows. 

REMARKS. --Many diversions above station for irrigation and municipal use affect low flow. Flow partly affected by Brady Creek 
Reservoir (see station 08144900), capacity 90,300 acre-ft (111 hm 3 ). 

MAXIMA: FOR AUGUST 1978. --Discharge, 27,000 ft 3 /s (765 m 3 /s) Aug. 3, 1978, gage height, 28.38 ft (8.650 m). 

FOR PERIOD 1915 to July 1978. --Maximum discharge, 203,000 ft 3 /s (5,750 m 3 /s) July 23, 1938, gage height, 39.3 ft (11.98 m), 

present site and datum, from rating curve extended above 41,000 ft 3 /s (1,160 m 3 /s) on basis of slope-area measurement of 

peak flow. 
HISTORIC. --Maximum stage since at least 1899, that of July 23, 1938. Flood of June 6, 1899, reached a stage of 36.7 ft 

(11.19 m), present site and datum, from information by by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


21 




8 




376 


16... 


264 


24. .. 




136 


2 


34 




9 




298 


17... 


213 


25... 




127 


3 


8,620 




10. .. 




256 


18... 


183 


26... 




124 


4 


8,520 




11 ... 




242 


19... 


160 


27.. 




124 


5 


1 ,020 




12... 




261 


20. .. 


148 


28... 




117 


6 


601 




13... 




212 


21... 


142 


29... 




126 


7 


470 




14. .. 




295 


22. .. 


140 


30... 




148 








15... 




367 


23... 


141 


31... 




134 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER SECOND. 








47 


775 


MONTHLY 








,600 


RUNOFF, 














.29 























Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1917 to July 1978- 



8,620 
117,000 



6,050 
99,200 



2,840 
51,700 



-92- 



COLORADO RIVER BASIN 

(57) 08147000 COLORADO RIVER NEAR SAN SABA, TX 

LOCATION. --Lat 3ri3'04", long 98°33'51", San Saba-Lampasas County, Hydrologic Unit 12090201, near left bank at downstream side 
of pier of bridge on U.S. Highway 190, 5.2 mi (8.4 km) dowstream from San Saba River, 9.2 mi (14.8 km) east of San Saba, and at 
mile 474.3 (763.1 km). 

DRAINAGE AREA. --30, 600 mi 2 (79,250 km 2 ), approximately, of which 12,880 mi 2 (33,360 km 2 ) probably is noncontributing. 

PERIOD OF RECORD.— October 1915 to October 1922 (published as "near Chadwick") October 1923 to August 1930 (published as "nea- 
Tow"), September 1930 to August 1978. Monthly discharge only for some periods, published in WSP 1312. 

GAGE. --Water-stage recorder. Datum of gage is 1,096.22 ft (334.128 m) National Geodetic Vertical Datum of 1929. See WSP 1922 
for history of changes prior to May 23, 1940. 

REMARKS. --Many diversion above station for irrigation, municipal use, and oilfield operation. Flow is affected by four reservoirs 
upstream from Winchell and one reservoir in the San Saba River and Pecan Bayou basins; combined capacity, 1,973,000 acre-ft (2.43 
km 3 ). Flow is affected at times by discharge from the flood-detention pools of 181 floodwater-retarding structures with combined 
detention capacity of 194,770 acre-ft (240 hm 3 ). These structures control runoff from 891 mi 2 (2,308 km 2 ). 

MAXIMA: FOR AUGUST 1978.— Discharge, 28,100 ft 3 /s (796 m 3 /s) Aug. 4, 1978, gage height, 22.59 ft (6.685 m). 

FOR PERIOD 1930 to July 1978. --Maximum discharge, 224,000 ft 3 /s (6,340 m 3 /s) July 23, 1938, gage height, 63.2 ft (19.26 m), 

present site, based on floodmarks at site then in use. 
HISTORIC. --Maximum stage during period 1878 to July 22, 1938, 58.4 ft (17.80 m) Sept. 25, 1900, discharge, 184,000 ft 3 /s 
(5,210 m 3 /s), present site, from floodmarks at former site. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1 


30 




8 




1 ,820 


16. .. 


393 


24. . . 


150 


2 


41 




9 




1,160 


17... 


307 


25... 


143 


3 


3,020 




10. .. 




836 


18... 


266 


26... 


130 


4 


19,700 




11... 




635 


19... 


224 


27... 


127 


5 


11,400 




12. . . 




547 


20. . . 


198 


28... 


124 


6 


17,700 




13... 




439 


21... 


178 


29... 


121 


7 


9,060 




14. .. 




357 


22. .. 


167 


30... 


127 








15... 




520 


23... 


156 


31... 


162 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 


IN CUBIC 


FEET 


PER SECOND, 








2 270 


MONTHLY 








139.000 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 - 

1931 to July 1978- 



19,700 
191,000 



16,300 
184,000 



7,950 
130,000 



-93- 



COLORADO RIVER BASIN 

(58) 08148000 LAKE BUCHANAN NEAR BURNET, TX 

LOCATION. --Lat 30°45'04", long 98°25'06", Burnet County, Hydrologic Unit 12090201, in powerhouse at Buchanan Dam on Colorado River, 
1.3 mi (2.1 km) upstream from bridge on State Highway 29, 11 mi (18 km) west of Burnet, and at mile 413.6 (665.6 km). 

QRATNAGr AREA. --31, 250 mi 2 (80,940 km 2 ), approximately, of which 12,880 mi 2 (33,360 km 2 ) probably is noncontributing. 

PERIOD OF RECORD. --May 1937 to August 1978. Prior to Oct. 1, 1968, published as Buchanan Reservoir. 

GAGE.--Nonrecording gage. Datum of gage is 0.48 ft (0.146 m) National Geodetic Vertical Datum of 1929 (levels by Lower Colorado 
River Authority). Prior to July 1938, temporary staff and float gages at same site and datum. 

REMARKS. --The lake is formed by two reinforced concrete multiple-arch sections, three banks of tainter gates, a 1,100-foot (335 m) 
uncontrolled concrete spillway section, and natural ground. A net opening of 1,270 ft (387 m) is controlled by thirty 33- by 
15-foot (10 by 5 m) and by seven 40- by 15-foot (12 by 5 m) tainter gates. The dam was completed and storage began May 20, 1937. 
Water is used for power development and for irrigation below Columbus. The power generating features consist of three generating 
units, each with a 12,677 kilowatt capacity. A pump-back unit (capacity, 840 ft 3 /s or 23.8 m 3 /s) returns water from Inks Lake to 
Lake Buchanan during off-peak power demand periods. Inflow is largely regulated by twelve major reservoirs with a combined 
capacity of 2,438,000 acre-ft (3.01 km 3 ), of which 1,091,000 acre-ft (1.35 km 3 ) is for flood control. For statement regarding 
regulation by Soil Conservation Service f loodwater-retarding structures, see Colorado River near San Saba (station 08147000). 
The capacity table is based on a 1925 survey. Figures given herein represent total contents. Data regarding the dam and lake 

a r e given in the following tab l ej 

Gage height Capacity 

(feet) (acre-feet) 

Top of dam 1,025.5 

Crest of gravity overflow spillway (top of conservation storage) 1,020.0 992,000 

Crest of spillway (15-foot gates) 1,005.0 678,000 

Crest of spillway (25-foot gates) 995.0 505,000 

Invert of three 12- foot-diameter penstocks 937.0 36,800 

COOPERATION. --Gage-height record furnished by Lower Colorado River Authority. 

MAXIMA (at 2400): FOR AUGUST 1978.— Contents, 814,700 acre-ft (1,000 hm 3 ) Aug. 8, 1978, gage height, 1,011.94 ft (308.439 m). 
FOR PERIOD 1937 to July 1978. --Maximum contents, 1,010,000 acre-ft (1.25 km 3 ) Jan. 24, 1968, gage height, 
1,020.8 ft (311.14 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 2400 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1 


698,900 


8. .. 


813,900 


16. . 


791 ,000 


24. .. 


761 ,000 


2 


700,800 


9. . . 


813,900 


17. . 


787,000 


25... 


757,000 


3 


700,800 


10.. 


813,900 


18.. 


783,000 


26. .. 


757,000 


4 


733,100 


11. . 


811 ,800 


19.. 


779,000 


27.. 


755,000 


5 


755,000 


12. . 


807,600 


20.. 


775,000 


28. .. 


751 ,000 


6 


787,000 


13.. 


801 ,300 


21. . 


773,000 


29... 


751 ,000 


7 


811 ,800 


14.. 


799,200 


22. . 


769,000 


30. .. 


751 ,000 






15.. 


795,000 


23. . 


765,000 


31... 


751 ,000 


CHANGE I 


N CONTENTS, IN 


ACRE-F 


:et 








52,100 













COLORADO RIVER BASIN 

(60) 08148500 NORTH LLANO RIVER NEAR JUNCTION, TX 

LOCATION. --Lat 30°31'06", long 99 48'39", Kimble County, Hydrologic Unit 12090202, on left bank 1,000 ft (305 m) upstream from 
remains of old Wilson Dam, 2.1 mi (3.4 km) northwest of Junction, and 4.1 mi (6.6 km) upstream from confluence with South Llano 
River. 

DRAINAGE AREA.--914 mi 2 (2,367 km 2 ). 

PERIOD OF RECORD.— September 1915 to September 1977, August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,699.92 ft (518.136 m) National Geodetic Vertical Datum of 1929. Prior to Aug. 1, 
1925, nonrecording gage at site 550 ft (168 m) downstream at same datum. Aug. 1, 1925, to Sept. 15, 1936, water-stage recorder 
520 ft (158 m) downstream at same datum. Sept. 16, 1936, to June 22, 1940, nonrecording gages at various sites at same datum. 

REMARKS. — Diversions for irrigation of about 500 acres (202 hm 2 ) will materially affect low flow. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 64,800 ft 3 /s (1,840 m 3 /s) Aug. 2, 1978, gage height, 23.50 ft (7.163 m). 

FOR PERIOD 1915 to 1977.— Maximum discharge, 94,800 ft 3 /s (2,680 m 3 /s) Sept. 16, 1936, gage height, 29.2 ft (8.90 m), 

present site, based on gage-height relation curve, from rating curve extended above 68,000 ft 3 /s (1,930 m 3 /s) on basis 

of slope-area measurement of peak flow. 
HISTORIC. --Maximum stage since at least 1875, that of Sept. 16, 1936; maximum stage during period 1875 to Sept. 15, 1936, 

27 ft (8.2 m) in 1889, from information by local resident. 



-95- 



COLORADO RIVER BASIN 

(61) 08150000 LLANO RIVER NEAR JUNCTION, TX 

LOCATION. — Lat 30°29'45", long 99°43'19", Kimble County, Hydrologic Unit 12090204, on right bank 600 ft (180 m) north of Farm Road 
2169, 1.4 mi (2.3 km) east of Junction, 3.6 mi (5.8 km) downstream from bridge on Interstate Highway 10, 3.9 mi (6.3 km) down- 
stream from confluence of North and South Llano Rivers, 4.3 mi (6.9 km) upstream from Johnson Fork, and 106.7 mi (171.7 km) up- 
stream from mouth. 

DRAINAGE AREA.— 1 ,874 mi 2 (4,854 km 2 ). 

PERIOD OF RECORD.— September 1915 to August 1978. 

GAGE.— Water-stage recorder. Datum of gage is 1,630.32 ft (496.922 m) National Geodetic Vertical Datum of 1929. Prior to Aug. 14, 
1925, nonrecording gage, and Aug. 14, 1925, to May 17, 1940, water-stage recorder at present site and datum. May 18, 1940, to 
Aug. 17, 1944, water-stage recorder at site 5,330 ft (1,620 m) upstream at datum 6.0 ft (1.83 m) higher. Since Aug. 18, 1944, 
gage at site 5,330 ft (1,620 m) upstream has been used as a supplementary gage. 

REMARKS. --Diversions above station for irrigation 

MAXIMA: FOR AUGUST 1978. --Discharge, 76,700 ft 3 /s (2,170 m 3 /s) Aug. 2, 1978, gage height, 22.14 ft (6.748 m). 

FOR PERIOD 1915 to July 1978. --Maximum discharge, 319,000 ft 3 /s (9,030 m 3 /s) June 14, 1935, gage height, 43.3 ft (13.20 m) 
at regular gage, 41.4 ft (12.62 m) at supplementary gage, from floodmarks, from curve extended above 54,000 ft 3 /s (1,530 
m 3 /s) on basis of slope-area rating measurements of 154,000 and 319,000 ft 3 /s (4,360 and 9,030 m 3 /s). 

HISTORIC. --Maximum stage since at least 1875, that of June 14, 1935. There was a major flood in 1889 which was the highest 
known prior to June 14, 1935. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


93 




8 




200 


16. .. 


134 


24. . . 




112 


2 


14,800 




9 




173 


17... 


131 


25... 




111 


3 


6,030 




10. .. 




160 


18.. . 


128 


26. . . 




109 


4 


610 




11... 




177 


19... 


124 


27... 




108 


5 


338 




12. .. 




172 


20... 


123 


28. .. 




107 


6 


258 




13... 




151 


21... 


120 


29... 




113 


7 


226 




14. .. 




143 


22... 


116 


30... 




115 








15... 




138 


23... 


113 


31. .. 




118 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER SECOND. 








50 


824 


MONTHLY 








,700 


RUNOFF, 














.51 























Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge 



Aug. 2 



0200 


1.38 


94 


1200 


1.51 


132 


1400 


1.54 


141 


1430 


12.68 


27,600 


1500 


15.95 


42,500 


1600 


20.56 


67,400 


1630 


22.14 


76,700 


1700 


21.76 


74,400 


1800 


18.29 


54,800 



Aug. 2 - 



Aug. 3 - 



1900 


12.40 


26,600 


Aug. 


3 - 0200 


9.17 


14,600 


2000 


7.63 


10,200 




0400 


7.13 


8,870 


2100 


6.08 


6,440 




1000 


5.56 


5,330 


2130 


8.95 


13,900 




1400 


4.07 


2,620 


2200 


11.11 


21 ,400 




1800 


3.30 


1,550 


2300 


12.97 


28,900 




2400 


2.72 


956 


2400 


13.43 


30,900 
















Aug. 


4-1200 


2.26 


574 


0100 


11.92 


24,600 




2400 


2.05 


427 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1917 to July 1978- 



14,800 
124,000 



7,150 
47,700 



3,210 
21,200 



COLORADO RIVER BASIN 

(62) 08150700 LLANO RIVER NEAR MASON, TX 

LOCATION. — Lat 30°39'35", long 99 o 06'29", Mason County, Hydrologic Unit 12090204, on right bank 98 ft (30 m) downstream from 
downstream bridge on U.S. Highway 87, 1.0 mi (1.6 km) upstream from Beaver Creek, 9.1 mi (14.6 km) southeast of Mason, 10.2 mi 
(16.4 km) downstream from James River, and 54.5 mi (87.7 km) upstream from mouth. 

DRAINAGE AREA. --3, 280 mi 2 (8,500 km 2 ). 

PERIOD OF RECORD. --March 1968 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,230.36 ft (375.014 m) National Geodetic Vertical Datum of 1929. Prior to Jan. 
19, 1971, at site 190 ft (58 m) upstream at same datum. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 92,500 ft 3 /s (2,620 m 3 /s) Aug. 3, 1978, gage height, 21.35 ft (6.507 m). 

FOR PERIOD 1968 to July 1978. --Maximum discharge, 151,000 ft*/s (4,280 m 3 /s) Oct. 13, 1973, gage height, 26.30 ft (8.016 
m), from rating curve extended above 59,000 ft 3 /s (1,670 m 3 /s) on basis of slope-area measurement of peak flow. 

HISTORIC. --Maximum flood since at least 1875 occurred June 14, 1935, discharge 388,000 ft 3 /s (11,000 m 3 /s), by slope- 
area measurement of peak flow at site 17.0 mi (27.4 km) downstream. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1.. 
2.. 
3.. 
4. . 
5.. 

6. . 

7. . 



95 

4,430 

30,300 

2,240 

947 

647 

526 



9.. 
10. 
11. 
12. 
13, 
14, 
15. 



362 
295 
255 
221 
201 
188 
177 
155 



16.., 
17.., 
18.., 
19... 
20... 
21... 
22. . , 
23... 



138 
128 
120 
115 
110 
106 
105 
101 



24... 
25... 

26. ., 
27.., 
28.., 
29... 

30.., 
31... 



95 
90 
86 
85 
82 
77 
75 
73 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


1 ,380 


MONTHLY TOTAL ACRE-FEET 


84,500 


RUNOFF, IN INCHES 


.48 





Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 
Date Hour ne ?nht Discharge Date Hour h e fght Discharge Date Hour ne ?nht Discharge 



Aug. 2 



0100 


1.68 


96 


Aug. 


2 - 2300 


10.98 


19,900 


Aug. 


3 


- 0800 


17.53 


38,800 


0600 


1.87 


143 




2330 


15.63 


45,100 






1200 


11.52 


21,100 


0900 


2.19 


260 




2400 


17.26 


56,600 






1800 


9.03 


11,400 


1200 


2.81 


640 














2400 


6.96 


5,630 


1300 


2.91 


712 


Aug. 


3 - 0100 


17.67 


59 ,800 












1400 


4.13 


1,490 




0300 


14.89 


40,400 


Aug. 


4 


- 0400 


5.84 


3,370 


1430 


4.81 


2,270 




0400 


14.46 


37,700 






1200 


4.74 


1,860 


1500 


6.22 


4,620 




0500 


16.60 


51 ,700 






2400 


4.06 


1,160 


2000 


7.61 


7,900 




0530 


19.09 


71 ,500 












2100 


7.64 


7,980 




0600 


21.35 


92,500 


Aug. 


5 


- 1200 


3.41 


906 


2200 


7.23 


6,910 




0630 


21.07 


89,700 






2400 


3.17 


749 


2230 


6.86 


6,010 




0700 


19.75 


77,300 













Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1969 to July 1978- 



30,300 
56,800 



12,300 
28,300 



5,640 
13,500 



-97- 



COLORADO RIVER BASIN 

(63) 08150800 BEAVER CREEK NEAR MASON, TX 

LOCATION (revised).--Lat 30°38'36", long 99°05'44", Mason County, Hydrologic Unit 12090204, on left bank at upstream side of bridge 
on U.S. Highway 87, 1.4 mi (2.3 km) upstream from Llano River, 6.4 mi (10.3 km) downstrea-i from Spring Creek, and 11.1 mi (17.9 
km) southeast of Mason. 

DRAINAGE AREA. —218 mi 2 (565 km 2 ). 

PERIOD OF RECORD. --July 1963 to August 1978. 

GAGE.— Water-st-T der. Datum of gage is 1,253.24 ft (381.988 m) National Geodetic Vertical DUum of 1929. Prior to Aug. 3, 

1978, at sit- (91 m) upstream at same datum. 

REMARKS. --No kn^' "ation or diversion above station. 

MAXIMA: FOR AUGUST 1978.— Discharge, 66,900 ft 3 /s (1,890 m 3 /s) Aug. 3, 1978, gage -eight, 24.0 ft (7.315 m). 

FOR PERIOD 1963 to July 1978. --Maximum discharge, 23,200 ft 3 /s (657 m 3 /s) May 16, 1965, gage height, 13.58 ft (4.139 m) , 
from rating curve extended above 7,400 ft 3 /s (210 m 3 /s) on basis of slope-area measurement of 20,100 ft 3 /s (569 m 3 /s). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 
DISCHARGE DAY DISCHARGE DAY DISCHARGE DAY 



DAY 



DISCHARGE 



1. .. 


.89 


8. 


2. .. 


616 


9. 


3... 


12,800 


10 


4... 


73 


11 


5. .. 


35 


12 


6. .. 


29 


13 


7. . . 


25 


14 
15 



22 


16 


18 


17 


16 


18 


14 


19 


13 


20 


11 


21 


9.7 


22 


7.1 


23 



5.0 


24 


3.4 


25 


2.7 


26 


2.5 


27 


2.2 


28 


2.1 


29 


1.9 


30 


1 .5 


31 



1.0 
1.4 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


443 


MONTHLY TOTAL ACRE-FEET 


27 ,200 


RUNOFF, IN INCHES 


2.34 





Gage height, in feet, a-id discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge 



Aug. 2 



0100 


1.85 


1.2 


0300 


1.98 


3.8 


0500 


2.10 


7.7 


0800 


2.30 


18 


1000 


2.72 


58 


1100 


4.54 


590 


1200 


5.54 


1,360 


1300 


5.22 


2,310 


1500 


6.07 


2,070 


1800 


5.07 


912 


2100 


4.23 


440 



Aug. 2 
Aug. 3 



2400 


3.76 


270 


Aug. 3 


- 1300 
1400 


5.97 
5.25 


4,060 
2,840 


0200 


3.82 


281 




1600 


4.35 


1,420 


0300 


5.29 


1,100 




1800 


3.76 


770 


0400 


13.37 


23,500 




2000 


3.35 


470 


0500 


18.91 


43,600 




2200 


3.03 


308 


0600 


24.00 


66,900 




2400 


2.77 


211 


0700 


20.00 


48,200 










0900 


13.90 


25,200 


Aug. 4 


- 0200 


2.56 


151 


1100 


11.10 


16,700 




0600 


2.28 


93 


1200 


9.00 


10,900 




1200 
2400 


2.00 
1.68 


59 
40 



Period 



Highest mean discharge, in cubic feet per second 
for the indicated number of consecutive days 

3 7 



August 1978 

1964 to July 1978- 



12,800 
5,040 



4,500 
2,090 



1,940 
919 



COLORADO RIVER BASIN 

(64) 08151500 LLANO RIVER AT LLANO, TX 

LOCATION. --Lat 30°45'10", long 98°40'10", Llano County, Hydrologic Unit 12090204, on right bank in Llano, 0.4 mi (0.6 km) down- 
stream frcm bridge on State Highway 16, 7 mi (11 km) upstream from Little Llano River, and 24.2 mi (38.9 km) upstream from mouth. 

DRAINAGE AREA. --4, 233 mi 2 (10,963 km 2 ). 

PERIOD OF RECORD. --September 1939 to August 1978. 

GAGE.— Water-stage recorder. Datum of gage is 970.01 ft (296.659 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --Many small diversions above station. Part of low flow of Llano River disappears into various formations, many of which 
are faulted, between stations near Junction and Llano. National Weather Service gage-height telemeter at station. 

MAXIMA: FOR AUGUST 1978. —Discharge, 139,000 ft 3 /s (3,940 m 3 /s) Aug. 3, 1978, gage height, 25.61 ft (7.806 m). 

FOR PERIOD 1939 to July 1978. --Maximum discharge, 232,000 ft 3 /s (6,570 m 3 /s) Sept. 10, 1952, gage height, 32.6 ft (9.94 m), 

from rating curve extended above 129,000 ft 3 /s (3,650 m 3 /s) on basis of slope-area measurement of peak flow. 
HISTORIC. --Maximum stage since at least 1879, 41.5 ft (12.65 m) June 14, 1935, discharge, 380,000 ft 3 /s (10,800 m 3 /s), from 

information by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


107 




8 




618 


16... 


189 


24... 




115 


2 


233 




9 




399 


17... 


175 


25... 




105 


3 


54,300 




10. .. 




314 


18... 


161 


26... 




104 


4 


6,000 




11... 




268 


19... 


147 


27... 




101 


5 


2,090 




12... 




225 


20... 


141 


28... 




101 


6 


1,760 




13... 




210 


21... 


141 


29... 




106 


7 


949 




14. .. 




215 


22.. . 


132 


30... 




101 








15... 




217 


23... 


117 


31... 




95 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER SECOND. 








2 
139 


,260 


MONTHLY 








000 


RUNOFF , 














. 61 























Gage height, in feet, and discharge , in cubic feet per second, at indicated time, 1978 
Date Hour heiaht Discharge Date Hour heiaht Discharge Date Hour heiaht Discharge 



Aug. 2 



Aug. 3 



1200 


1.93 


219 


Aug. 3 


- 0700 


24.50 


126,000 


Aug. 


3 


- 2400 


9.14 


12,600 


2400 


2.38 


377 




0800 


25.00 


132,000 




















0900 


25.61 


139,000 


Aug. 


4 


- 0600 


7.63 


7,290 


0100 


6.05 


4,570 




1000 


24.50 


126,000 






1200 


6.92 


5,300 


0300 


7.00 


6,560 




1200 


21.40 


92,400 






2400 


5.93 


3,100 


0400 


10.00 


15,700 




1500 


17.00 


54,600 












0500 


17.60 


59,100 




1700 


14.20 


36,100 


Aug. 


5 


- 1200 


5.25 


2,000 


0600 


21.00 


88,400 




2000 


10.65 


18,300 






2400 


4.82 


1,420 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1941 to July 1978- 



54,300 
54,900 



20,800 
35,500 



9,450 
15,500 



-99- 



COLORADO RIVER BASIN 

(65) 08152000 SANDY CREEK NEAR KINGSLANP, TX 

LOCATION. — Lat 30°33'30", long 98°28'19", Llano County, Hydrologic Unit 12090201, on left bank at downstream side of bridge on State 
Highway 71, 3.9 mi (6!3 km) upstream from Lake Lyndon B. Johnson, and 7.3 mi (11.7 km) south of kingsland. 

DRAINAGE AREA. --327 mi 2 (847 km 2 ). 

PERIOD OF RECORD.— October 1966 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 862.31 ft (262.832 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --Some diversions above station for irrigation, amount unknown. 

MAXIMA: FOR AUGUST 1978.— Di scharge , 3,610 ft 3 /s (102 m'/s) Aug. 2, 1978, gage height, 8.89 ft (2.710 m). 

FOR PERIOD 1966 to July 1978.— Maximum discharge, 21,200 ft 3 /S (600 m 3 /s) Apr. 15, 1977, gage height, 15.86 ft (4.834 m). 
HISTORIC. --The flood of Sept. 11, 1952, which was the highest since at least 1881, reached a stage of 34.2 ft (10.42 m), 
discharge 163,000 ft 3 /s (4,620 m 3 s), from slope-area measurement at gage site. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1. . . 


22 


8. 


2. .. 


1 ,140 


9. 


3. . . 


498 


10 


4... 


212 


11 


5. . . 


55 


12 


6. .. 


30 


13 


/. . . 


17 


14 
15 



9.3 


16.. 


7.4 


17.. 


5.9 


18.. 


5.0 


19.. 


4.0 


20.. 


3.2 


21.. 


2.5 


22.. 


1.8 


23.. 



1.3 


24. . 


1.1 


25.. 


.66 


26. . 


.46 


27.. 


.46 


28.. 


.60 


29.. 


.71 


30.. 


.63 


31.. 



.63 
.63 
.63 
.55 
.61 
.34 
.34 
.34 



MONTHLY MEAN DISCHARGE, IN CUBIC 


FEET PER SECOND 


65.3 


MONTHLY TOTAL ACRE-FEET 




4,010 


RUNOFF, IN INCHES 




.23 





Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1967 to July 1978- 



1,140 
6,670 



617 
3,810 



282 
1,990 



-100- 



COLORADO RIVER BASIN 

(68) 08153500 PEDERNALES RIVER NEAR JOHNSON CITY, TX 

LOCATION. — Lat 30"17'27", long 98°24'01", Blanco County, Hydrologic Unit 12090206, near center of span at downstream side of br- 'qe 
on U.S. Highway 281, 0.2 mi (0.3 km) downstream from Towhead Creek, 1.1 mi (1.8 km) northeast of Johnston City, 3.4 mi (5.5 I ) 
downstream from Buffalo Creek, and 48.2 mi (77.6 km) upstream from mouth. 

DRAINAGE AREA.— 947 mi 2 (2,453 km 2 ). 

PERIOD OF RECORD. --May 1939 to August 1978. 

GAGE. --Water-stage recorder and concrete control. Datum of gage is 1,096.70 ft (334.274 m) National Geodetic Vertical Datum of 
1929. May 4 to Sept. 13, 1939, nonrecording gage, and Sept. 14, 1939, to Sept. 10, 1952, water-stage recorder at upstream side 
of bridge at same datum. Sept. 11, 1952, to June 29, 1953, nonrecording gage, and June 30, 1953, to Oct. 7, 1954, water-stage 
recorder at site 360 ft (110 m) downstream at same datum. 

MAXIMA: FOR AUGUST 1978.— Di scharge, 127,000 ft 3 /s (3,597 m 3 /s) Aug. 3, 1978, gage height, 24.9 ft (7.59 m). 

FOR PERIOD 1939 to July 1978. --Maximum discharge, 441,000 ft J /s (12,500 m 3 /s) Sept. 11, 1952, gage height, 42.5 ft 

(12.95 m), from floodmark, from rating curve extended above 116,000 ft 3 /s (3,290 m 3 /s) on basis of slope-area measure- 
ment of 441,000 ft 3 /s (12,500 m 3 /s). 

HISTORIC. --Maximum stage since at least 1859, 42.5 ft (12.95 m) Sept. 11, 1952; flood of July 1869 reached a stage of 33 
ft (10.1 m), from information by local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 
DISCHARGE DAY DISCHARGE DAY DISCHARGE DAY 



DAY 



DISCHARGE 



1.. . 


123 


2... 


22,400 


3.. . 


30,100 


4. .. 


2,580 


5. . . 


743 


6... 


451 


7. . . 


1 ,230 



455 


16 


277 


17 


220 


18 


191 


19 


166 


20 


148 


21 


133 


22 


123 


23 



113 


24 


102 


25 


96 


26 


88 


27 


87 


28 


83 


29 


76 


30 


72 


31 



70 
64 
64 
57 
57 
54 
51 
54 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


1 ,950 


MONTHLY TOTAL ACRE-FEET 


120,000 


RUNOFF, IN INCHES 


2.38 





Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date Hour 



Gage 
height 



Discharge Date Hour 



Gage 
height 



Discharge Date 



Hour height Dischar 9 e 



Aug. 1 - 



Aug. 2 



0800 


10.44 




40 


Aug. 2 


- 1230 


14.62 


16,500 


Aug. 


3-1230 


22.77 


100,000 


1200 


10.48 




64 




1300 


16.43 


30,200 




1300 


23.17 


105,000 


1700 


10.52 




96 




1400 


19.05 


56,500 




1315 


24.90 


127,000 


1800 


10.63 




202 




1500 


19.86 


65,500 




1330 


24.50 


122,000 


1900 


10.72 




327 




1600 


20.20 


69,400 




1400 


24.00 


115,000 


2300 


10.67 




252 




1700 


19.42 


60,600 




1500 


21.79 


88,200 


2330 


10.69 




280 




1900 


17.64 


41,400 




1700 


19.27 


58,900 


2400 


11.01 




994 




2100 


15.70 


24,200 




1900 


16.48 


30,600 












2400 


14.30 


14,500 




2100 


14.69 


17,000 


0100 


11.15 


1 


,380 












2400 


13.02 


7,900 


0500 


10.99 




935 


Aug. 3 


- 0200 


13.42 


9,640 










0515 


11.62 


2 


,850 




0600 


12.00 


4,130 


Aug. 


4 - 0400 


11.94 


3,910 


0530 


12.29 


5 


,100 




1100 


11.38 


2,070 




0800 


11.51 


2,500 


0600 


12.79 


6 


,970 




1130 


11.35 


1,970 




1200 


11.32 


1 ,880 


0700 


13.13 


8 


,370 




1145 


18.30 


48,200 




1800 


11.15 


1,380 


1000 


12.69 


6 


,580 




1200 


20.79 


76,400 




2400 


11.03 


1,060 


1200 


13.54 


10 


,200 



















Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1940 to July 1978- 



30,100 
129,000 



18,400 
61 ,800 



8,280 
26,700 



-101- 



COLORADO RIVER BASIN 

(69) 08154500 LAKE TRAVIS NEAR AUSTIN, TX 

' 'i' '"I " ■-! it 30°23'29", long 97"54'24", Travis County, "ydrologic Unit 12090205, in powerhouse at Mansfield Dam on Colorado River, 
! '• • . .7 km) downstrean from Sandy i.rrr 1 - , 1? mi | ' ' n) northwest of Austin, and at mi le 318.0 (511.7 km). 

"A. --38, 130 mi 2 (98,760 km 2 ) - rroxinately, of which 12, ^ c p- J (33,360 km 2 ) probably is noncontributing. 

" r FrfcORD. --September 1940 to Aun"t P78. Pri 0r to October 1148, published as Marsh. 11 Ford Reservoir near Austin. 

. j. .--Nonrecordi ng naic. *w of .;?•■" : 0,1? r t (r.037 r) National Geodetic Vertical Datum of 1929 (levels by Bureau of Reclama- 
tion). Prior f . '6. IC-m, staf* ' : left hank near dam, datum is NGVD. Dec. 26, 1940, to February 1942, mercury 
manoueter in pc "e, datum is NGVLi. 

REMARKS. --The lakr "S 'nvrned by a 7,098-foot-l ong (2,163 m) concrete gravity, earth, and rockfill dam. Storage began Sept. 9, 1940, 
and dam was connlcted in early 1942. Capacity curve is based >n October 1939 survey. Capacity between gage heights 681.0 and 
714.0 ft (207.57 and 217.63 m) is 778,000 acre-ft (959 hm 3 ) and is reserved for flood control. Water is used for power develop- 
ment and for irrigation below Columbus. Figures given herein represent total contents. Data regarding the dam and lake are 

gi v en in the f ol lowing tabl e: 

Gage height Capacity 

(feet) (acre- feet) 

Top of dam (roadway) 750.1 

Design flood 748.9 3,223,000 

Crest of spillway 714.0 1,950,000 

Top of power storage 681.0 1,172,000 

Lowest gated outlet ( in vert) 535.8 27,900 

COOPERATION. — Records of daily gage heights and capacity curve furnished by Lower Colorado River Authority. 

MAXI'IA (at 2400): FOR AUGUST 1978. --Contents , 868,200 acre-ft (1.07 km 3 ) Aug. 4, 1978, gage height, 662.90 ft (202.052 m). 
FOR PERIOD 1940 to July 1978. --Maximum contents, 1,770,000 acre-ft (2.18 km 3 ) May 18, 1957, gage height, 
707.4 ft (215.62 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 2400 



DAY 



CONTENTS 



DAY 



CONTENTS 


DAY 


862,200 


16... 


864,000 


17. . . 


865,200 


18... 


866,600 


19. . . 


867,500 


20. .. 


865,500 


21... 


865,800 


22... 


866,000 


23. . . 



CONTENTS 



DAY 



CONTENTS 



652,500 
682,400 
814,600 
868,200 
863,900 
861 ,900 
860,900 



9. 

10, 

11, 

12, 

13. 

14 

15. 



866 


700 


24. 


865 


,800 


25. 


865 


,800 


26. 


864 


600 


27. 


862 


,800 


2f . 


862 


100 


29. 


861 


,000 


30. 


858 


,500 


31. 



857,400 
855,000 
852,200 
848,000 
846,200 
840,000 
834,200 
828,900 



CHANGE IN CONTENTS, IN ACRE-FEET. 



181 ,200 






GUADALUPE RIVER BASIN 

(70) 08165300 NORTH FORK GUADALUPE RIVER NEAR HUNT, TX 

LOCATION. -Lat 30°03'36", long 99°23'40", Kerr County, Hydrologic Unit 12100201, on right bank 410 ft (125 m) downstream from 
Ranch Road 1340, 1.3 mi (2.1 km) downstream from Bear Creek, 3.7 mi (6.0 km) west of Hunt, and 4.1 mi (6.6 km) upsteam froi 



rom Hone. 



Creek 

DRAINAGE AREA.--168 mi 2 (435 km 2 ). 
PERIOD OF RECORD.— August 1967 to August 1978. 
GAG 1929 Water " Sta9e reC ° rder and crest - sta 9 e 9 a 9 es - Datum ° f 9a9e is 1,800.10 ft (548.670 m) National Geodetic Vertical Datum of 

REMARKS-There is a permit upstream from station issued by the Texas Department of Water Resources to impound and use 20.33 
acre-ft (25,100 m 3 ) of water on a game preserve. 



MAXIMA: 



FOR AUGUST 1978. -Di scharge , 39,300 ft 3 /s (1,110 m 3 /s) Aug. 3, 1978, gage height, 26.8 ft (8 17 m) 

FOR PERIOD 1967 to July 1978.— Maximum discharge, 38,400 ft 3 /s (1,090 m 3 /s) Oct 13, 1973, gage height 26.55 f 

from rating curve extended above 170 ft 3 /s (4.81 m 3 /s) on basis of slope-area measurements of 7 460 and 38 

(211 and 1 ,090 m 3 /s). 



ft (8.092 m), 
400 ft 3 /s 

HIS ^ R i^""3 aX IT Stage sinCe at least 1900 occured Jul y 1. 1932, gage height, 37.3 ft (11.37 m), discharge, 140,000 ft 3 /s 
(3,960 m /s by si ope- area measurements, combined flow of North Fork Guadalupe River 5 mi (8 km) upstream and Bear 
Creek 2 mi (3 km) upstream from mouth, and adjusted for difference in drainage area. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


44 




8 




95 


16. . . 


46 


24. . . 




35 


2 


6,370 




9 




86 


17... 


44 


25... 




35 


3 


5,870 




10. .. 




79 


18... 


43 


26. . . 




34 


4 


194 




11... 




72 


19... 


41 


27... 




33 


5 


135 




12... 




65 


20. . . 


39 


28... 




32 


6 


120 




13... 




60 


21... 


38 


29... 




32 


7 


109 




14... 




59 


22... 


37 


30. . . 




33 








15... 




52 


23... 


36 


31... 




32 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER SECOND. 








27 


452 


MONTHLY 








,800 


RUNOFF, 














3.10 























Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge 



Aug. 


1 - 0100 


4.14 


15 




0800 


4.43 


26 




1200 


4.70 


41 




2400 


5.06 


76 


Aug. 


I - 0100 


5.81 


234 




0200 


6.15 


333 




0300 


8.31 


1,530 




0400 


9.30 


2,390 




0500 


15.47 


10,000 




0600 


14.43 


8,560 




0700 


16.36 


11,400 




0800 


24.80 


31,900 



Aug. 2 



Aug. 3 



0900 


22.07 


23,100 


Aug. 3 


- 0400 


19.03 


16,100 


1000 


18.34 


14,800 




0500 


20.82 


20,100 


1200 


15.45 


10,000 




0700 


15.70 


10,400 


1400 


11.43 


4,660 




0800 


12.31 


5,720 


1600 


9.46 


2,550 




1000 


9.37 


2,460 


1800 


8.29 


1,520 




1200 


8.05 


1,340 


2100 


7.12 


755 




1500 


6.96 


670 


2400 


6.66 


527 




1800 
2400 


6.45 
5.94 


440 
269 


0100 


8.20 


1,450 










0200 


20.24 


18,700 


Aug. 4 


- 1200 


5.6' 


187 


0300 


26.80 


39,300 




2400 


5.44 


152 



Period 



Highest mean discharge , in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1968 to July 1978- 



6,370 
8,640 



4,140 
3,120 



1,840 
1,390 



GUADALUPE RIVER BASIN 

(71) 08165500 GUADALUPE RIVER AT HUNT, TX 

LOCATION. — Lat 30°04'08", long 99°19'23", Kerr County, Hydrologic Unit 12100201, on right bank 56 ft (17 m) upstream and 137 ft (42 
m) right of right end of bridge on State Highway 39, 0.6 mi (1.0 km) downstream from confluence of North and South Forks, 0.8 mi 
(1.3 km) east of Hunt, and at mile 430.9 (693.3 km), 

DRAINAGE AREA. --288 mi 2 (746 km 2 ). 

PERIOD OF RECORD. --October 1941 to September 1949, discharge not computed above 600 ft 3 /s (17.0 m 3 /s), and April 1965 to August 
1978. Occasional discharge measurements made 1950 to 1964. 

GAGE. — Water-stage recorder and crest-stage gages. Datum of gage is 1,722.7 ft (525.08 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --Numerous diversions for irrigation above station, amounts unknown. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 62,900 ft 3 /s (1,780 m 3 /s) Aug. 2, 1978, gage height, 23.50 ft (7.163 m). 

FOR PERIOD 1965 to July 1978. --Maximum discharge, 47,000 ft 3 /s (1,330 m 3 /s) Aug. 13, 1966, gage height, 21.4 ft (6.52 m) , 

from floodmark, from rating curve extended above 3,700 ft 3 /s (105 m 3 /s) on basis of channel geometry and flow-over-dam 

measurement of peak flow. 
HISTORIC. --Maximum stage since 1900, 36.6 ft (11.16 m) July 2, 1932, from information by local resident, discharge 206,000 

ft 3 /s (5,830 m 3 /s), determined by slope-area measurement 4.5 mi (7.2 km) downstream from gage. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


621 




8 




234 


16. . . 


111 


24... 




76 


2 


16,300 




9 




189 


17... 


106 


25... 




70 


3 


9,460 




10... 




171 


18. .. 


102 


26... 




71 


4 


687 




11... 




151 


19... 


97 


27... 




73 


5 


424 




12... 




141 


20. . . 


94 


28. .. 




71 


6 


342 




13... 




129 


21... 


95 


29... 




69 


7 


324 




14... 




116 


22. . . 


85 


30... 




84 








15... 




117 


23... 


82 


31 . .. 




74 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER SECOND, 








61 


992 


MONTHLY 








,000 


RUNOFF, 














3.97 























Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge Date 



Hour h Ga ^ t 
height 



Discharge 



Aug. 


1 - 0700 


1.02 


23 


Aug. 2 


- 0300 


11.00 


5,050 




0800 


1.16 


36 




0400 


13.62 


9,760 




0900 


1.63 


99 




0500 


14.79 


13,100 




1000 


2.03 


174 




0600 


20.81 


42,800 




1030 


4.33 


757 




0700 


23.50 


62,900 




1100 


7.82 


1,960 




0800 


21.16 


45,300 




1130 


9.73 


3,420 




1000 


22.25 


52,800 




1200 


9.58 


3,270 




1100 


20.20 


38,800 




1300 


7.71 


1,910 




1200 


16.60 


19,900 




1500 


5.37 


1,050 




1300 


14.70 


12,800 




1900 


3.51 


543 




1400 


12.90 


8.150 




2300 


2.91 


380 




1500 


11.20 


5,310 




2400 


3.35 


498 




1800 
2400 


9.20 
6.70 


2,910 
1,510 


Aug. 


2 - 0100 


5.47 


1,080 












0200 


9.85 


3,540 


Aug. 3 


- 0100 


6.13 


1,310 



Aug. 3 



Aug. 4 



0200 


11.00 


5,050 


0300 


16.00 


17,500 


0400 


20.00 


37,600 


0500 


22.25 


52,800 


0600 


20.20 


38,800 


0700 


16.60 


19,900 


0800 


14.70 


12,800 


1000 


11.20 


5,310 


1200 


9.60 


3,290 


1600 


7.75 


1,930 


2400 


5.70 


1,160 


0600 


4.55 


813 


1200 


3.83 


628 


2400 


3.40 


512 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1966 to July 1978- 



16,300 
15,700 



8,820 
6,090 



4,020 
2,710 



GUADALUPE RIVER BASIN 
(72) 08166000 JOHNSON CREEK NEAR INGRAM, TX 
LOCATION. -Lat 30"06'00\ long 99°16'58' , Kerr Count/, Hydrologic Unit 12100201, on right bank 1.6 mi (2.6 km) upstream from 
Kerrvil?e. ' "" ' . ' northwest 0f Ingram ' 3 ' 8 mi < 6A km > u P stream fr ™ "»<*". and 9.2 mi (U.8 km) northwest of 

DRAINAGE AREA. — 114 mi J (295 km 2 ). 

PERIOD OF RECORD. --September 1941 to November 1959, October 1961 to August 1978. 

GAGE. -Water-stage recorder. Datum of gage is 1,721.30 ft (524.652 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --Numerous small diversions above station for irrigati 'n. 

MAXIMA: FOR AUGUST 1978. -Discharge, 73,900 ftVs (2,090 mVs) Aug. 3, 1978, gage height 21.4 ft (6 52 m) 

FOR PERIOD 1941 to July 1978. -Maximum discharge, 95,900 ftVs (2,720 mVs) Oct. 4, 1959, gage height 24 25 ft (7 391 m) 

YZ "hT^^Y**!"^ ab ° Ve M0 ° ftVs (125 mVs) on basls of ^ope-area measurement of 9,100 and 16 OOOft'/s 
(258 and 453 m 3 /s) and conveyance study. 

HIS n8'ooo"ft"/Tn S q?n e *JT f 1 ?" t 18SZ ' 35 ft (1 °- 7 m) Ju1y 2 ' 1932 ' from '"fonnation by local resident; discharge, 
or 7 m? «'' i 'V' \ °P e " arM measurement at point 0.5 mi (0.8 km) downstream from State fish hatchery and 6 

f : t s; oc m z s: t 9age - Flood of June 14 - 1935, reached a stage ° f 3i ° r 3z n (9 - 4 ° r g - 8 m >> fr ° m 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, 

DAY DISCHARGE"' "dAY DISCHARGE d'ay" oil 



AUGUST 1978 
CHARGE 



MONTHLY 
MONTHLY 
RUNOFF, 



TOTAL ^m-F^Ef '" CUB ' C "" '" SEC ° N ° 
IN INCHES .'. 



DAY 



DISCHARGE 




726 

44,600 

7.34 



Gage height, 



Date 



Hour 



Aug. 



Aug. 2 



Gage 
height 



in feet, and disch arge, in cubic feet per second, at indicated time, 1978 



Discharge 



- 0600 


1.43 




7.9 


0800 


1.44 




9.2 


0900 


1.50 




19 


1000 


1.60 




42 


1400 


1.65 




56 


1800 


1.59 




40 


2200 


1.57 




33 


2400 


1.64 




53 


- 0100 


2.05 




188 


0200 


5.00 


1 


,590 


0300 


6.17 


2 


,830 


0400 


6.36 


3 


,070 


0600 


5.56 


? 


,140 


0700 


6.70 


3 


,510 



ate 



Aug. 2 - 



Aug. 3 



Hour 


Gage 
height 


Discharge 


0800 


8.30 


6,080 


0900 


10.00 


10,000 


1000 


11.08 


13,500 


1100 


10.00 


10,000 


1300 


8.80 


7,120 


1400 


7.30 


4,370 


1500 


6.00 


2,630 


1700 


4.30 


1,120 


2000 


3.13 


582 


2200 


2.80 


457 


2300 


2.90 


496 


2400 


7.20 


4,220 


0100 


10.00 


1 
10,000 


0200 


21.40 


73,900 



Date 



Hour 



Aug. 3 - 



Aug. 4 



Gage 
height 



Discharge 



0300 


17.98 


50,100 


0400 


18.42 


53,000 


0600 


18.04 


50,500 


0700 


20.32 


66,200 


0800 


14.39 


28,300 


0900 


10.50 


11,500 


1000 


8.12 


5,730 


1200 


5.79 


2,390 


1400 


4.46 


1,190 


1800 


3.36 


597 


2400 


2.78 


348 


1200 


2.42 


205 


2400 


2.26 


148 



Period 



August 1978 

1943 to July 1978- 



Uighest mean discharge, in cubic feet per second 
for the indxcated number of consecutive days 
3 7 



17,200 
4,050 



7,040 
"" ,710 



3,080 
845 



GUADALUPE RIVER BASIN 

(75) 08167000 GUADALUPE RIVER AT COMFORT, TX 

LOCATION. — Lat 29°57'55", long 98°53'49", Kendall County, Hydrologic Unit 12100201, on left bank at downstream side of pier of 
bridge on U.S. Highway 87, 0.1 mi (0.2 km) downstream from Cypress Creek, and at mile 396.6 (638.1 km). 

DRAINAGE AREA. --838 mi 2 (2 170 km 3 ). 

PERIOD OF RECORD. --May 1939 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,372.05 ft (418.201 m) National Geodetic Vertical Datum of 1929. Prior to Nov. 27, 
1939, nonrecording gage. 

REMARKS. --Many small diversions above station for irrigation. 

MAXIMA: FOR AUGUST 1978. — Discharge, 240,000 ft 3 /s (6,800 m 3 /s) Aug. 2, 1978, gage height, 40. SO ft (12.466 m). 

FOR PERIOD 1939 to July 1978. --Maximum discharge, 111,000 ft 3 /s (3,140 m 3 /s) Oct. 4, 1959, c i&a height, 33.15 ft (10.104 
m), from rating curve extended above 65,000 ft 3 /s (1,840 m 3 /s) on basis of slope-area measurement of 182,000 ft 3 /s 
(5,150 m 3 /s), gage height, 38.4 ft (11.70 m), made at former gaging station "near Comfort" 5 mi (8 km) upstream. 

HISTORIC. --Maximum stage since at least 1848, 40.90 ft (12.466 m) Aug. 2, 1978, discharge 240,000 ft 3 /s (6,800 m 3 /s). 
Flood of July ldo9 reacied a stage of 40.3 ft (12.28 m) from report by Corps of Engineers. 



MEAN DISCHARGE, IN CUBIC FEET P r R SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


873 




8 




936 


16. . . 


416 


24. . . 




274 


2 


74,200 




9 




772 


17... 


398 


25. .. 




257 


3 


55,100 




10. . . 




695 


18... 


371 


26. . . 




250 


4 


3,820 




11... 




619 


19... 


357 


27... 




241 


5 


1 ,800 




12... 




561 


20. . . 


341 


28... 




235 


6 


1,270 




13... 




519 


21 ... 


326 


29... 




234 


7 


1 ,330 




14.. . 




480 


22... 


311 


30. .. 




249 








15... 




450 


23... 


292 


31... 




259 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER SECOND. 








4 
294 


,780 


MONTHLY 








,000 


RUNOFF, 














6.58 























Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date 



Hour 



Gage 
height 



Discharge Date 



Hour 



Gage 
height 



Discharge Date Hour 



Gage 
height 



Discharge 



Auq. 


1 - 0900 


4.10 


50 


Aug. 


2 - 1000 


38.82 


203,000 


Aug. 


3 


- 1400 


27.83 


69,200 




1500 


4.14 


56 




1100 


36.07 


161,000 






1600 


23.67 


39,900 




1600 


4.36 


103 




1200 


34.19 


137,000 






1800 


19.87 


21 ,700 




1700 


6.12 


1,040 




1500 


30.89 


98,600 






2100 


16.45 


12,000 




1800 


8.25 


1,990 




1800 


26.23 


56,400 






2400 


14.52 


7,870 




1900 


9.85 


2,760 




2100 


21.36 


28,000 














2400 


11.26 


3,580 




2400 


17.58 


14,600 


Aug. 


4 


- 0600 
1200 


12.31 

10.88 


4,520 

3,330 


Aug. 


2 - 0300 
0400 


11.74 
13.24 


3,960 
5,710 


Aug. 


3 - 0300 
0500 


15.20 
19.38 


9,260 
20,100 






2400 


9.00 


2,340 




0500 


15.85 


10,700 




0600 


30.76 


97,200 


Aug. 


5 


- 1200 


8.00 


1,770 




0600 


22.97 


36,000 




0700 


33.98 


134,000 






2400 


7.49 


1,450 




0700 


30/8 


99,500 




0800 


35.08 


148,000 














0800 


37.55 


183,000 




0900 


34.87 


145,000 


Aug. 


6 


- 1200 


7.18 


1,260 




0900 


40. an 


240,000 




1100 


33.00 


122,000 






2400 


7.04 


1 ,170 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1940 to July 1978- 



74,200 
27,300 



44,400 
13,700 



19,800 
6,840 



GUADALUPE RIVER BASIN 

(76) 08167500 GUADALUPE RIVER NEAR SPRING BRANCH, TX 

LOCATION.— Lat 29 51'38", long 98°22'58", Comal County, Hydrologic Unit 12100201, on right bank at downstream side of bridge on 
county road, 226 ft (69 m), downstream from bridge on Ranch Road 311, 1.9 mi (3.1 km) southeast of Spring Branch Post Office, 7.5 
mi (12.1 km) downstream from Curry Creek, and at mile 334.4 (538.0 km). 

DRAINAGE AREA. --1,315 mi 2 (3,406 km 2 ). 

PERIOD OF RECORD. --June 1922 to August 1978. 

GAGE.— Water-stage recorder and crest-stage gages. Datum of gage is 948.10 ft (288.981 m) National Geodetic Vertical Datum of 
1929. 

REMARKS. --Several small diversions above station for irrigation. Guadalupe-Blanco River Authority gage-height telemeter at 
station. 

MAXIMA: FOR AUGUST 1978.— Discharge, 158,000 ft 3 /s (4,470 m 3 /s) Aug. 3, 1978, gage height, 45.25 ft (13.792 m). 

FOR PERIOD 1922 to July 1978.— Maximum discharge, 121,000 ft 3 /s (3,430 mVs) July 3, 1932 (gage height, 42.10 ft or 12.832 

m), from rating curve extended above 70,000 ft 3 /s (1,980 m 3 /s). 
HISTORIC— Maximum stage since at least 1859, about 53 ft (16.2 m) in 1869; flood in July 1900 reached a stage of about 49 

ft (14.9 m), from information by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 
DISCHARGE DAY DISCHARGE DAY DISCHARGE DAY 



DAY 



DISCHARGE 



1.. . 


62 


8. .. 


2,020 


16 


2. .. 


6,730 


9. .. 


1,500 


17 


3. . . 


76,500 


10. . 


1,240 


18 


4. .. 


46,300 


11 .. 


1,020 


19 


5. . . 


4,290 


12.. 


881 


20 


6. .. 


2,550 


13.. 


806 


21 


7. . . 


2,280 


14.. 


735 


22 






15.. 


664 


23 



608 


24 


569 


25 


545 


26 


508 


27 


483 


28 


456 


29 


438 


30 


421 


31 



396 
375 
356 
344 
332 
322 
326 
332 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND. 

MONTHLY TOTAL ACRE-FEET 

RUNOFF, IN INCHES 



4,980 
306,000 



1.37 



Gage height, in feet, and discharge, in oubio feet per second, at indicated time, 1978 



Date 


Hour 


Gage 
height 


Discharge 


Date 


Hour 


Gage 
height 


Discharge 


Date 


Hour 


Gage 
height 


Discharge 


Aug. 1 


- 0300 
1200 


2.20 
2.37 




40 
64 


Aug. 


2 


- 2400 


34.00 


54,400 


Aug. 


4 


- 0200 
0300 


40.60 
39.40 


118,000 
108,000 




2400 


2.55 




95 


Aug. 


3 


- 0100 
0200 


37.80 
42.00 


94,500 
130,000 






0800 
1200 


32.30 
27.80 


56,300 
36,400 


Aug. 2 


- 0300 


2.57 




99 






0300 


45.25 


158,000 






1600 


21.40 


21,300 




0600 


2.77 




144 






0400 


44.40 


152,000 






2000 


14.00 


10,400 




1000 


3.07 




232 






0800 


38.00 


96,100 






2400 


11.00 


6,920 




1100 


3.90 




611 






1200 


32.70 


58,800 














1200 


5.10 


1 


,290 






1900 


25.60 


30,100 


Aug. 


5 


- 0400 


9.40 


5,340 




1400 


6.60 


2 


,320 






2000 


28.00 


37,000 






1200 


8.00 


4,100 




1600 


8.25 


3 


,580 






2200 


32.60 


58,100 






2400 


6.90 


3,240 




1800 


10.95 


6 


,050 






2400 


37.00 


88,300 














2000 


17.70 


14 


,400 












Aug. 


6 


- 1200 


5.87 


2,420 




2200 


25.30 


27 


,600 


Aug. 


4 


- 0100 


39.20 


106,000 






2400 


5.85 


2,400 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1923 to July 1978- 



76,500 
66,100 



43,200 
32,700 



20,100 
14,900 



-107- 



GUADALUPE RIVER BASIN 

(77) 08167600 REBECCA CREEK NEAR SPRING BRANCH, TX 

LOCATION. --Lat 29°55'06", long 98°22'10", Comal County, Hydrologic Unit 12100201, on right bank 72 ft (22 m) upstream from private 
road crossing, 2.9 mi (4.7 km) upstream from mouth, 3.7 mi (6.0 km) northeast of Spring Branch Post Office, and 6.3 mi (10.1 km) 
south of Twin Sisters. 



DRAINAGE AREA. --10. 9 mi 2 (28.2 km 2 ). 

PERIOD OF RECORD. --January 1960 to August 1978. 



GAGE. --Water-stage recorder and concrete control. Datum of gage is 985.55 ft (300.396 m) National Geodetic Vertical Datum of 1929 
(Corps of Engineers bench mark). 

REMARKS. — Six dams forming recreational lakes at housing developments upstream control runoff from 3.13 mi 2 (8.11 km 2 ) drainage 
area. Amount of impoundment unknown. Recording rain gage located at station. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 1.5 ft J /s (0.042 m 3 /s) Aug. 1, 1978, gage height, 2.06 ft (0.628 m). 

FOR PERIOD 1960 to July 1978. --Maximum discharge, 9,300 ft 3 /s (263 m 3 /s) Oct. 18, 1965, gage height, 7.97 ft (2.429 m), 

from rating curve extended above 420 ft 3 /s (11.9 m 3 /s) on basis of critical-depth measurement of 4,340 ft 3 /s (123 m 3 /s). 
HISTORIC. --Maximum stage since at least 1885, 25.5 ft (7.77 m) in September 1952. Flood in 1947 or 1948 was about 4.5 ft 

(1.4 m) lower than flood in 1952, from infromation by local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 




.40 
.40 
.40 
.40 
.60 
.59 
.56 
.54 



16. . . 
17... 
18... 
19. .. 
20... 
21... 
22... 
23... 



.47 


24. . 


.40 


25.. 


.40 


26. . 


.40 


27.. 


.40 


28.. 


.40 


29. . 


.40 


30. . 


.40 


31.. 



.40 
.40 
.40 
.40 
.40 
.40 
.40 
.40 



MONTHLY MEAN DISCHARGE, 
MONTHLY TOTAL ACRE-FEET, 
RUNOFF, IN INCHES 



IN CUBIC FEET PER SECOND. 



.51 
31.1 
.05 



Period 



Highest mean discharge , in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1961 to July 1978- 



1.4 
637 



1 .1 
337 



0. 
206 



-108- 



GUADALUPE RIVER BASIN 

(78) 08167700 CANYON LAKE NEAR NEW BRAUNFELS, TX 

LOCATION.— Lat 29°52'07", long 98 H'55", Comal County, Hydrologic Unit 12100201, in intake structure of Canyon Dam on Guadalupe 
River, 12 mi (19 km) northwest of New Braunfels, and at mile 303.0 (487.5 km). 

DRAINAGE AREA. --1,432 mi 2 (3,709 km 2 ). 

PERIOD OF RECORD. --July 1962 to August 1978. Prior to October 1970, published as Canyon Reservoir. 

GAGE. --Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929 (levels by Corps of Engineers). Prior to 
Sept. 24, 1964, nonrecording gage at present site and datum. 

REMARKS. --The lake is formed by a rolled earthfill dam 6,830 ft (2,082 m) long, consisting of the main dam 4,410 ft (1,344 m) long, 
an earthen dike 210 ft (64 m) long, a 1,260-foot (384 m) long uncontrolled broad-crested type spillway, and a 950-foot (290 m) 
concrete and earthen nonoverflow section. Deliberate impoundment of water began June 16, 1964, and main part of dam was com- 
pleted in August 1964. The flood-control outlet works consist of a 10.0-foot-diameter (3.0 m) conduit controlled by two 5.7- by 
10.0-foot (1.7 by 3.0 m) hydraulical ly operated slide gates. The lake was built for water conservation and flood control. 
Capacity table beginning Oct. 1, 1974, is based on a sedimentation survey of August 1972. Small diversions above the lake for 
i r rigation. Figures given herein represent total contents. Data regarding the dam and lake are given in the following t able : 

Elevation Capacity 

(feet) (acre-feet) 

Top of dam 974.0 

Crest of spillway 943.0 736,700 

Top of conservation pool 909.0 382,000 

Lowest gated outlet (invert) 775.0 240 

COOPERATION. — Records furnished by Corps of Engineers and reviewed by Geological Survey. 

MAXIMA: FOR AUGUST 1978. --Contents, 588,400 acre-ft (725 hm 3 ) Aug. 4, 1978, elevation, 930.61 ft (283.650 m). 

FOR PERIOD 1962 to July 1978. --Maximum contents, 460,400 acre-ft (568 hm 3 ) Apr. 22, 1977, elevation, 917.96 ft (279.794 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 2400 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1... 


362,200 


8... 


563,600 


16.. 


494,500 


24... 


422,700 


2... 


369,800 


9... 


555,600 


17.. 


485,300 


25. .. 


416,600 


3. .. 


500,800 


10.. 


547,300 


18. . 


475,500 


26. .. 


415,400 


4. .. 


588,400 


11.. 


538,300 


19.. 


467,500 


27. . 


414,200 


5... 


583,400 


12.. 


530,100 


20.. 


458,400 


28... 


413,000 


6. . . 


577,600 


13.. 


520,700 


21.. 


449,500 


29... 


41 1 ,500 


7 ... 


570,500 


14.. 


512,400 


22.. 


441 ,100 


30. .. 


410,100 






15. . 


503,500 


23.. 


431 ,100 


31... 


409,100 


CHAN( 


iE IN CONTENTS, IN 


ACRE-FI 


:et 








48,600 













GUADALUPE RIVER BASIN 

(79) 08167800 GUADALUPE RIVER AT SATTLER, TX 

LOCATION. — Lat 29°51'32", long 98°10 ' 47" , Comal County, Hydrologic Unit 12100202, on right bank 200 ft (61 m) upstream from Horse- 
shoe Falls, 0.8 mi (1.3 km) north of Sattler, 1.8 mi (2.9 km) downstream from Canyon Dam, 2.3 mi (3.7 km) upstream from Heiser 
Hollow, 11.2 mi (18.0 km) north of New Braunfels, and at mile 301.2 (484.6 km). 

DRAINAGE AREA. --1,436 mi 2 (3,719 km 2 ), 1,432 mi 2 (3,709 km 2 ) is above Canyon Dam. 

PERIOD OF RECORD. --March 1960 to August 1978. 

GAGE. — Water-stage recorder and concrete control. Datum of gage is 742.24 ft (226.235 m) National Geodetic Vertical Datum of 1929 
(Corps of Engineers bench mark). 

REMARKS. --Flow completely regulated since July 21, 1962, by Canyon Lake (station 08167700) 1.8 mi (2.9 km) upstream. Small diver- 
sions above station for irrigation. 

MAXIMA: FOR AUGUST 1978. --Di scharge , 5,850 ft 3 /s (166 m 3 /s) Aug. 5, 1978, gage height, 8.31 ft (2.533 m). 

FOR PERIOD 1960 to July 1978.— Maximum discharge, 20,800 ft 3 /s (589 m 3 /s) Oct. 29, 1960, gage height, 12.20 ft (3.719 m). 

Maximum discharge since closure of Canyon Dam on July 21, 1962, 5,390 ft 3 /s (153 m 3 /s) Feb. 11, 1975, gage height, 8.18 

ft (2.493 m). 
HISTORIC. --Maximum stage since closure of Canyon Dam, 8.31 ft (2.533 m) Aug. 5, 1978, discharge 5,850 ft 3 /s (166 m 3 /s). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


123 




8 


5,550 


16. .. 


5,390 


24. . . 


5,210 


2 


99 




9 


5,520 


17... 


5,360 


25... 


3,610 


3 


98 




10. . . 


5,390 


18... 


5,330 


26... 


939 


4 


1,820 




11... 


5,380 


19... 


5,320 


27... 


936 


5 


5,680 




12.. . 


5,410 


20. .. 


5,290 


28... 


939 


6 


5,620 




13... 


5,420 


21... 


5,260 


29... 


946 


7 


5,570 




14.. . 


5,440 


22. . . 


5,260 


30. . . 


946 








15... 


5,420 


23... 


5,240 


31... 


946 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 


IN CUBIC 


FEET PER SECOND. 








3,850 


MONTHLY 








237 ,000 

















Period 



Highest mean discharge , in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1961 to July 1978- 



5,680 
10,000 



5,620 
6,380 



5,530 
5,220 



GUADALUPE RIVER BASIN 

(82) 08179000 MEDINA RIVER NEAR PIPE CREEK, TX 

LOCATION. --Lat 29°40'31", long 98°58'33", Bandera County, Hydrologic Unit 12100302, on right bank 500 ft (150 m) upstream from 
Bandera Falls, 0.6 mi (1.0 km) upstream from Red Bluff Creek, and 4.1 mi (6.6 km) southwest of Pipe Creek. 

DRAINAGE AREA. --474 mi 2 (1,228 km 2 ). 

PERIOD OF RECORD. --October 1922 to June 1935, October 1952 to August 1978. Monthly discharge only for some periods, published in 
WSP 1312 and 1732. 

GAGE. --Water-stage recorder. Datum of gage is 1,067.37 ft (325.334 m) National Geodetic Vertical Datum of 1929. December 1922 
to June 1935, water-stage recorder at site 1.9 mi (3.1 km) upstream at different datum. 

REMARKS. --Smal 1 diversion above station. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 281,000 ft 3 /s (7,960 m 3 /s) Aug. 2, 1978, gage height, 49.6 ft (15.118 m). 

FOR PERIOD 1922 to July 1978. --Maximum discharge, 72,900 ft 3 /s (2,060 m 3 /s) July 15, 1973, gage height, 37.3 ft (11.37 

m), from floodmark, from rating curve extended above 32,000 ft 3 /s (906 m 3 /s) on basis of slope-area measurement of 

64,000 ft 3 /s (1,810 m 3 /s). 
HISTORIC. --Maximum stage since at least 1880, 49.6 ft (15.118 m) Aug. 2, 1978, discharge, 281,000 ft 3 /s (7,960 m 3 /s). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


27 




8 




776 


16... 


336 


24... 




236 


2 


41 ,700 




9 




816 


17... 


321 


25... 




227 


3 


15,000 




10. .. 




581 


18... 


304 


26... 




221 


4 


3,680 




11... 




478 


19... 


288 


27... 




214 


5 


2,870 




12.. . 




449 


20. . . 


274 


28... 




207 


6 


2,030 




13... 




413 


21... 


266 


29... 




202 


7 


1 ,420 




14... 




387 


22... 


254 


30... 




205 








15... 




356 


23... 


244 


31... 




205 


MONTHI Y 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES. . 


IN CUBIC 


FEET 


PER SECOND. 








2 

149 


420 


MONTHLY 








,000 


RUNOFF , 














5.89 























Gage height, in feet, and discharge, in cubic feet per second, at indicated time, 1978 



Date Hour ^ Discharge Date Hour ^ 



Gage 



Discharge Date Hour hpiaht Discharge 



Aug. 


1 - 0600 
1200 


3.88 
3.96 




16 
26 


Aug. 


2 - 1200 
1300 


45.00 
38.70 


160,000 
95,100 


Aug. 


3 


- 2400 


10.70 


6,710 




1900 


3.96 




26 




1400 


33.20 


64,200 


Aug. 


4 


- 1200 


8.60 


4,260 




2400 


4.22 




60 




1600 
1900 


25.20 
18.40 


36,100 
19,800 






2400 


7.80 


3,450 


Aug. 


2 - 0300 
0400 


4.20 
7.10 


1 


57 
,060 




2400 


15.55 


14,300 


Aug. 


5 


- 1200 
2400 


7.15 
6.65 


2,840 
2,410 




0500 


8.20 


1 


,810 


Aug. 


3 - 0200 


15.00 


13,300 














0700 


9.75 


3 


,230 




0300 


20.70 


24,900 


Aug. 


6 


- 1200 


6.15 


2,000 




0800 


11.65 


5 


,360 




0400 


23.00 


30,400 






2400 


5.80 


1,720 




0900 


27.95 


39 


,000 




0500 


21.20 


26,000 














1000 


43.60 


119 


,000 




1200 


15.80 


14,700 


Aug. 


7 


- 1200 


5.45 


1,460 




1100 


49.60 


281 


,000 




1800 


13.40 


10,600 






2400 


5.20 


1,260 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1924 to July 1978- 



41 ,700 
23,000 



20,100 
15,000 



9,640 
7,900 



-111- 



GUADALUPE RIVER BASIN 

(83) 08179100 RED BLUFF CREEK NEAR PIPE CREEK, TX 

LOCATION —Lat 29°40'51" long 98°57 , 19", Bandera County, Hydrologic Unit 12100302, on left bank 0.8 mi (1.3 km) upstream from 
bridge on Farm Road 1283, 1.8 mi (2.9 km) downstream from Pipe Creek, 1.9 mi (3.1 km) upstream from mouth, and 3.2 mi (5.1 km) 
south of Pipe Creek. 

DRAINAGE AREA.— 56.3 mi 2 (145.8 km 2 ). 

PERIOD OF RECORD. --April 1956 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,107.2 ft (337.475 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --Small dams on upstream tributaries affect flow during time of storm runoff. No known diversion. 

MAXIMA: FOR AUGUST 1978. -Di scharge , 160 ft-/s (4.53 m 3 /s) Aug. 2, 1978, gage height, 3.7 ft (1.13 m). 

FOR PERIOD 1956 to July 1978.— Maximum discharge, 46,900 ft 3 /s (1,330 m 3 /s) Sept. 27, 1964, gage height, 22.64 ft (6.901 

m) from rating curve extended above 2,000 ft 3 /s (56.6 m 3 /s) on basis of slope-area measurement of peak flow. 
HISTORIC— Maximum stage since at least 1905, that of Sept. 27, 1964. A stage of about 17 ft (5.2 m) was reached in July 
1937. Flood in October 1953 reached a stage of 13.8 ft (4.21 m). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



1.. . 

2. .. 
3... 

4. .. 

5. . . 

6. .. 

7. .. 


.00 8.. 

70 9. . 

5.4 10. 

.01 11. 

.00 12. 

.00 13. 

.00 14. 

15. 


.00 16 
.00 17 
.00 18 
.00 19 
.00 20 
.00 21 
.00 22 
.00 23 






00 24... .00 
00 25... .00 
00 26... .00 
00 27... .00 
00 28... .00 
00 29... .00 
00 30... .00 
00 31... .00 


MONTHI Y MFAN niSCHARRF IN f 


JBIC FEET PER SECOND .... 






2.43 


MONT 
RUNO 


1LY TOTAL ACRE-FEET 








150 


: F, IN INCHES 






.05 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 -- 

1957 to July 1978- 



70 
4,090 



25 
1,830 



11 
993 



-112- 



GUADALUPE RIVER BASIN 

(84) 08179500 MEDINA LAKE NEAR SAN ANTONIO, TX 

LOCATION. — Lat 29°32'24", long 98°56'01", Medina County, Hydrologic Unit 12100302, at gate operating platform, 576 ft (176 m) from 

left end of Medina Dam on Medina River, 4.2 mi (6.8 km) upstream from Medina diversion dam, 13 mi (21 km) north of Castroville, 

28 mi (45 km) west of San Antonio, and 70.4 mi (113.3 km) upstream from mouth. Water-quality sampling site at the center of 
low-water bridge 0.6 mi (1.0 km) downstream. 

DRAINAGE AREA. --634 mi 2 (1,642 km 2 ). 

PERIOD OF RECORD. --May 1913 to August 1978. Prior to October 1965, monthend contents only. 

GAGE.--Nonrecordi ng gage read once daily if stage changing materially, otherwise intermittently. Datum of gage is 7.80 ft (2.377 m) 
below National Geodetic Vertical Datum of 1929. 

REMARKS. --The lake is formed by a gravity-type concrete dam 1,580 ft (482 m) long. The dam was completed and storage began May 7, 
1913. The uncontrolled spillway section is a cut through natural rock 880 ft (268 m) long, with a 3-foot-wide (1 m) cutoff wall, 
located near right end of dam. The dam and lake are owned by the Bexar-Medina-Atascosa Counties Water Improvement District No. 
1, which has a permit from he Texas Water Rights Commission to irrigate 150,000 acres (60,700 hm 2 ) annually. An undetermined 
amount of water from the lake enters the Edwards and associated limestones in the Balcones Fault Zone, part of which is above and 
part below the dam. Water is released downstream to Medina Diversion Reservoir where it is diverted into Medina Canal by the 
Water District. Figures given herein represent total contents. Data regarding the dam and lake are given in the following 

t abjej 

Gage height Capacity 

(feet) (acre- feet) 

Top of dam 1,084.0 

Crest of spillway 1,072.0 254,000 

Water-supply outlet pipes (invert) 966.5 4,780 

Lowest gated outlet (invert) 920.0 0_ 

COOPERATION. --Capacity table, based on survey made prior to June 1912, and gage height record furnished by Bexar-Medina-Atascosa 
Counties Water Improvement District No. 1. 

MAXIMA (at 0800): FOR AUGUST 1978. --Contents, 281,000 acre-ft (346 hm 3 ) Aug. 2, 1978, gage height, 1,076.67 ft (328.169 m). 

FOR PERIOD 1913 to July 1978. --Maximum contents observed, 288,800 acre-ft (356 hm 3 ) Sept. 16, 1919, gage height, 
1,078.0 ft (328.57 m). 



CONTENTS, IN ACRE-FEET, AUGUST 1978 
INSTANTANEOUS OBSERVATIONS AT 0800 



DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


DAY 


CONTENTS 


1. .. 


188,200 


8. .. 


265,000 


16.. 


255,700 


24. .. 


254,600 


2. .. 


198,100 


9. . . 


262,100 


17.. 


255,200 


25. . . 


254,600 


3... 


280,100 


10.. 


259,200 


18.. 


255,200 


26. . . 


254,600 


4. . . 


278,300 


11. . 


256,900 


19.. 


255,200 


27. . 


254,600 


5. .. 


274,300 


12.. 


256,300 


20.. 


255,200 


28. .. 


254,000 


6. . . 


271 ,400 


13.. 


255,700 


21.. 


255,200 


29. . . 


254,000 


7. .. 


268,500 


14.. 


255,700 


22.. 


255,200 


30. .. 


254,000 






15.. 


255,700 


23. . 


254,600 


31. .. 


254,000 


CHAN( 


5E IN CONTENTS, IN 


ACRE-F 


"ET 








65 ,400 















-113- 



GUADALUPE RIVER BASH 



(86) 08180800 MEDINA RIVER NEAR SOMERSET, TX 

LOCATION. — Lat 29°15'45", long 98°34'56", Rexar County, Hydrologic Unit 12100302, on left bank 300 ft (91 m) upstream from bridge on 
State Highway 16, 2.1 mi (3.4 km) upstream from Elm Creek, 4.9 mi (7.9 km) downstream from Medio Creek, 5.2 mi (8.4 km) northeast 
of Somerset, and 14.1 mi (22.7 km) upstream from mouth. 

DRAINAGE AREA. --967 mi 2 (2,505 km 3 ), 634 mi 2 (1,642 km 2 ) above dam forming Medina Lake. 

PERIOD OF RECORD. --October 1970 tc August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 493.56 ft (150.437 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --Flow is regulated by Medina Lake (station 08179500) 56 mi (90 km) upstream and by Medina Diversion Lake, capacity 4,500 
acre-ft (5.55 hm 3 ). A large part of the streamflow is lost into the Edwards and associated limestones in the Balcones Fault Zone 
which crosses the basin between the upstream end of Medina Lake and about 5 mi (8 km) downstream from Medina Dam or 0.9 mi (1.4 
km) downstream from the diversion dam. There are several small diversions below Medina Diversion Dam. 

MAXIMA: FOR AUGUST 1978.— Discharge, 12,800 ft 3 /s (362 m 3 /s) Aug. 4, 1978, gage height, 22.35 ft (6.812 m). 

FOR PERIOD 1970 to July 1978.— Maximum discharge, 30,500 ft 3 /s (864 m 3 /s) July 17, 1973 gage height, 29.39 ft (8.958 m). 

UTQTnDTr __M = wim..m r + 3 ™ c i nro ak^.if 10QO fhif n-F li.li. 17 1Q71 



I Ull I l_ It i VI' ±J I \J t, W UUIJf -L J I V . i U I* i IIIU II i.l I J i_ I I I.I I y \. , ^W,~"-IW I L /J \ V 

HISTORIC. --Maximum stage since about 1890, that of July 17, 1973. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 

DAY DISCHARGE DAY DISCHARGE DAY 



DAY 



DISCHARGE 



DISCHARGE 



1... 


62 


2... 


268 


3... 


2,260 


4... 


10,700 


5... 


6,450 


6... 


3,470 


7 ... 


2,190 



1,880 


16 


1 ,570 


17 


1 ,170 


18 


974 


19 


848 


20 


746 


21 


664 


22 


595 


23 



536 


24 


477 


25 


420 


26 


372 


27 


327 


28 


289 


29 


263 


30 


231 


31 



196 
162 
145 
133 
125 
120 
118 
121 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND 


1 220 


MONTHLY TOTAL ACRE-FEET 







Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1971 to July 1978- 



10,700 
24,800 



6,870 
15,900 



4,070 
9,540 



-114- 



GUADALUPE RIVER PAS IN 

(87) 08181500 MEDINA RIVER AT SAN ANTONIO, TX 

LOCATION. — Lat 29°15'14", long 98°28'20", Rexar County, Hydrologic Unit 12100302, near left bank on downstream side of pier of ur- 
stream bridge of two bridges on U.S. Highway 281 in San Antonio and 6.8 mi (10.9 km) upstream from mouth. 

DRAINAGE AREA. --1,317 mi 2 (3,411 km 2 ), 634 mi 2 (1,642 km 2 ) is above dan forming Medina Lake. 

PERIOD OF RECORD. —October 1929 to December 1930, July 1939 to August 1978. October 1929 to December 1930 records below about 50 
ft 3 /s (1.42 m 3 /s) in connection with seepage investigation (published as "at Losoya"). Published as "near San Antonio" July 1939 
to September 1970. 

GAGE. --Water-stage recorder. Datum of gage is 439.0 ft (133.81 m) National Geodetic Vertical Datum of 1929 (levels by Corps of 
Engineers). October 1929 to December 1930 nonrecording gage at Losoya 1.5 mi (2.4 km) downstream at different datum. 

REMARKS. --Flow is slightly regulated by Medina Lake (station 08179500) 60 mi (97 km) upstream and diversion dam reservoir, capacity 
4,500 acre-ft (5.55 hm 3 ). For statement concerning losses into the Edwards and associated limestones formation, see Medina River 
near Somerset (station 08180800). 

MAXIMA: FOR AUGUST 1978. --Di scharge , 1,030 ft 3 /s (29.2 m 3 /s) Aug. 4, 1978, gage height, 29.95 ft (9.129 m). 

FOR PERIOD 1939 to July 1978. --Maximum discharge, 31,900 ft 3 /s (903 m 3 /s) Sept. 17, 1973, gage height, 43.59 ft (13.286 m). 
HISTORIC. --Maximum stage, 55 ft (16.8 m) sometime prior to construction of Medina Dam in 1913, from information by Texas 
Department of Highways and Public Transportation. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


247 




8. . . 


1 ,650 


16... 


630 


24. . . 




339 


2 


788 




9. .. 


1 ,500 


17... 


5 58 


25... 




312 


3 


434 




10.. 


1 ,210 


18... 


508 


26. .. 




287 


4 


7,760 




11 .. 


1 ,100 


19... 


462 


27... 




262 


5 


6,250 




12.. 


977 


20... 


428 


28... 




256 


6 


3,370 




13.. 


856 


21... 


397 


29... 




251 


7 


2,140 




14. . 


762 


22.. . 


387 


30. . . 




256 








15.. 


689 


23... 


366 


31... 




255 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 


IN CU 


HC FEET PER SECOND. 








1 
70 


1 50 


MONTHLY 








800 

















Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1941 to July 1978- 



7,760 
28,300 



5,790 
18,600 



3,410 
10,600 



GUADALUPE RIVER BASIN 

(88) 08183900 CIB0LO CREEK CREEK NEAR POERNE, TX 

LOCATION. — Lat 29°46'26", long 98°41'50", Kendall County, Hydrologic Unit 12100304, on left bank 0.6 mi (1.0 km) upstream from 
Southern Pacific Lines bridge, 0.9 mi (1.4 km) downstream from Menger Creek, and 2.5 mi (4.0 km) southeast of Boerne. 

DRAINAGE AREA. --68. 4 mi 2 (177.2 km 2 ). 

PERIOD OF RECORD. --March 1962 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,339.61 ft (408.313 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --No known diversion above station. 

MAXIMA: FOR AUGUST 1978. --Di scharge, 462 ft 3 /s (13.1 m 3 /s) Aug. 2, 1978, gage height, 3.65 ft (1.113 m). 

FOR PERIOD 1962 to July 1978. --Maximum discharge, 36,400 ft 3 /s (1,030 m 3 /s) Sept. 27, 1964, gage height, 19.15 ft (5.837 
m), from floodmark, from rating curve extended above 2,500 ft 3 /s (70.8 m 3 /s) on basis of slope-area measurement at 
12'000 ftVs (340 m 3 /s) and contracted-opening measurement of 36,400 ft 3 /s (1,030 m 3 /s). 

HISTORIC. --Maximum stage since at least 1892, that of Sept. 27, 1964. Second highest flood in 1952 reached a stage of 16.3 
ft (4.97 m), discharge 25,600 ft 3 /s (725 m 3 /s), from information by local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 




1.5 


16.. 


.97 


17. . 


.88 


IS.. 


.89 


19. . 


.93 


20.. 


1.0 


21 .. 


1.0 


22. . 


.90 


23.. 



.88 


24. 


.96 


25. 


1.0 


26. 


1.1 


27. 


1.1 


28. 


1.2 


29. 


1.2 


30. 


1.2 


31. 



1.1 

1.4 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND. 

MONTHLY TOTAL ACRE-FEET 

RUNOFF, IN INCHES 



5.15 
316 
.09 



Period 



Highest mean discharge , in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1963 to July 1978- 



97 
3,830 



41 
1,510 



19 
831 



-116- 



NUECES RIVER BASIN 

(89) 08195000 FRIO RIVER AT CONCAN, TX 

LOCATION. --Lat 29°29'18", long 99°42'16", Uvalde County, Hydrologic Unit 12110106, on left bank 0.7 mi (1.1 km) southeast of Concan 
Post Office, 15 mi (24 km) upstream from Dry Frio River, and 224.1 mi (360.6 km) upstream from mouth. 

DRAINAGE AREA.--405 mi 2 (1,049 km 2 ). 

PERIOD OF RECORD. --October 1923 to September 1929, October 1930 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,203.71 ft (366.891 m) National Geodetic Vertical Datum of 1929. Oct. 26, 1923, to 
July 28, 1924, nonrecording gage at site 86 ft (26 m) upstream at datum 5.08 ft (1.548 m) lower. July 29, 1924, to Oct. 3, 1930, 
nonrecording gage, and Oct. 4, 1930, to May 18, 1939, water-stage recorder, at site 130 ft (40 m) downstream at present datum, 
gage at 

REMARKS. --Many small diversion for irrigation above station. 

MAXIMA: FOR AUGUST 1978.— Discharge, 3,350 ft 3 /s (94.9 m 3 /s) Aug. 2, 1978, gage height, 6.90 ft (2.103 m). 

FOR PERIOD 1923 to July 1978. --Maximum discharge, 162,000 ft 3 /s (4,590 m 3 /s) July 1, 1932, gage height, 34.44 ft (10.497 
m), from floodmarks, from rating curve extended above 44,000 ft 3 /s (1,250 m 3 /s) on basis of flow-over-dam measurement of 
56,600 ft 3 /s (1,600 m 3 /s) and slope-area measurement of 162,000 ft 3 /s (4,590 m 3 /s). 
HISTORIC. --Maximum stage since at least 1869, that of July 1, 1932. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 




65 




8 




165 


16... 


105 


24. .. 




81 


2 




834 




9 




151 


17... 


101 


25. .. 




79 


3 




616 




10. .. 




139 


18... 


97 


26. . . 




77 


4 




415 




11... 




133 


19... 


95 


27... 




77 


5 




280 




12.. . 




129 


20... 


91 


28... 




74 


6 




207 




13... 




126 


21... 


88 


29... 




75 


7 




184 




14. .. 




118 


22. .. 


86 


30... 




75 










15... 




no 


23... 


83 


31... 




75 


MONTHLY 


MEAN 
TOTAL 
IN IN 


DISCHARGE, 

ACRE-FEET 

CHES. . 


IN CUBIC 


FEET 


PER SECOND. 








9 


162 


MONTHLY 








,980 


RUNOFF 














.46 























Period 



Highest mean discharge , in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1926 to July 1978 



834 
52,000 



622 

23,700 



386 
11,000 



-117- 



NUECES RIVER BASIN 

(90) 08196000 DRY FRIO RIVER NEAR REAGAN WELLS, TX 

LOCATION. --Lat 29°30'16", long 99°46'52", Uvalde County, Hydrologic Unit 12110106, on right bank 2.3 mi (3.7 km) upstream from 
bridge on U.S. Highway 83, 3.1 mi (5.0 km) upstream from Rocky Creek, and 4.3 mi (6.9 km) southeast of Reagan Wells. 

DRAINAGE AREA. --1 17 mi 2 (303 km 2 ). 

PERIOD OF RECORD.— September 1952 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,335.2 ft (406.97 m) National Geodetic Vertical Datum of 1929. 

REMARKS. --Several small diversions above station. 

MAXIMA: FOR AUGUST 1978. — Di scharge , 1,500 ft 3 /s (42.5 m 3 /s) Aug. 1, 1978, gage height, 5.23 ft (1.594 m). 

FOR PERIOD 1952 to July 1978. --Maximum discharge, 123,000 ft 3 /s (3,480 m 3 /s) Aug. 13, 1966, gage height, 27.6 ft (8.41 m), 

from floodmark, from rating curve extended above 900 ft 3 /s (25.5 m 3 /s) on basis of slope-area measurements of 11,400, 

30,700, 64,700, and 123,000 ft 3 /s (323, 869, 1,830, and 3,480 m 3 /s). 
HISTORIC. --Maximum stage since at least 1875 occurred in 1880, about 33 ft (10.1 m). Flood of June 14, 1935, reached a 

stage of 26.0 ft (7.92 m), discharge at site 2.6 mi (4.2 km) upstream, 64,700 ft 3 /s (1,830 m 3 /s), and that of July 1, 

1932, reached a stage of 23 ft (7.0 m), discharge at site 2.0 mi (3.2 km) upstream, 30,700 ft 3 /s (869 m 3 /s), from 

information by local residents. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 

DAY DISCHARGE DAY DISCHARGE DAY 



DAY 



DISCHARGE 



DISCHARGE 




29 


16 


27 


17 


25 


18 


22 


19 


18 


20 


15 


21 


15 


22 


15 


23 



16 

15 

14 

12 
9.8 

12 
8.8 
8.1 



24. 
25. 
26. 
27. 
28. 
29. 
30. 
31. 



7, 
7, 
5. 
5. 
6. 
14 
6. 
6, 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND. 

MONTHLY TOTAL ACRE-FEET 

RUNOFF, IN INCHES 



32.4 
1 ,990 

.32 



Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1953 to July 1978- 



334 
,100 



179 
3,160 



98 
1,440 



.118- 



NUECES RIVER BASIN 

(91) 08198000 SABINAL RIVER NEAR SABINAL, TX 

LOCATION. --Lat 29°29'35", long 99°29'49", Uvalde County, Hydrologic Unit 12110106, on right bank 108 ft (33 m) upstream from 
concrete dam, 2.3 mi (3.7 km) downstream from mouth of Onion Creek, and 12.5 mi (20.1 km) north of Sabinal. 

ORAINAGE AREA.--206 mi 1 (534 km 2 ). 

PERIOO OF RECORD. --October 1942 to August 1978. 

RAGE. --Water-stage recorder. Datum of gage is 1,131.20 ft (344.790 m) National Geodetic Vertical Datum of 1929. Prior to Apr. 9, 
at 1971, site 0.3 mi (0.5 km) downstream at same datum. 

REMARKS. --Several small diversions above station for irrigation. 

MAXIMA: FOR AUGUST 1978.— Discharge, 23,200 ft 3 /s (657 m 3 /s) Aug. 2, 1978, gage height, 19.43 ft (5.922 m). 

FOR PERIOD 1942 to July 1978. --Maximum discharge, 55,200 ft 3 /s (1,560 m 3 /s) June 17, 1958 gage height, 28.3 ft (8.63 m), 

from floodmark at present site, from rating curve extended above 6,900 ft 3 /s (195 m 3 /s) on basis of slope-are 

measurement of 55,200 ft 3 /s (1,560 m 3 /s). 
HISTORIC. --Maximum stage since at least 1892, about 33 ft (10.1 m) July 2, 1932, from information by local residents. 

There is a legend that a flood in the middle 1800's reached a stage of nearly 63 ft (19.2 m). 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 



DAY 


DISCHARGE 




DAY 


DISCHARGE 


DAY 


DISCHARGE 


DAY 


DISCHARGE 


1 


49 




8 




96 


16... 


52 


24... 




36 


2 


5,710 




9 




86 


17... 


49 


25... 




29 


3 


1 ,480 




10... 




78 


18... 


45 


26. .. 




32 


4 


331 




11 . .. 




73 


19... 


42 


27... 




48 


5 


186 




12. .. 




68 


20... 


40 


28... 




46 


6 


135 




13... 




63 


21... 


38 


29... 




49 


7 


111 




14... 




61 


22... 


37 


30... 




49 








15... 




56 


23... 


35 


31... 




52 


MONTHLY 


MEAN DISCHARGE, 
TOTAL ACRE-FEET 
IN INCHES 


IN CUBIC 


FEET 


PER SECOND, 








18 


299 


MONTHLY 








400 


RUNOFF, 














1 .67 























Period 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1943 to July 1978- 



5,710 
13,000 



2,510 
5,020 



1,150 
2,540 



-119- 



NUECES RIVER BASIN 

(92) 08200000 HONDO CREEK NEAR TARPLEY, TX 

LOCATION. --Lat 29°34'10", long 99°14'47", Medina County, Hydrologic Unit 12110107, on left bank 460 ft (140 m) downstream from 
bridge on Ranch Road 462, 6.3 mi (10.1 km) southeast of Tarpley, and 16.6 mi (26.7 km) northwest of Hondo. 

DRAINAGE AREA. --86. 2 mi 2 (223.3 km 2 ). 

PERIOD OF RECORD. --August 1952 to August 1978. 

GAGE. --Water-stage recorder. Datum of gage is 1,169.1 ft (356.34 m) National Geodetic Vertical Datum of 1929 (Magnolia Oil Co. 
bench mark). 

REMARKS. --Several small diversions for irrigation above station. 

MAXIMA: FOR AUGUST 1978.— Discharge, 13,200 ft 3 /s (374 m 3 /s) Aug. 2, 1978, gage height, 13.10 ft (3.993 m). 

FOR PERIOD 1952 to July 1978. --Maximum discharge, 69,800 ft 3 /s (1,980 m 3 /s) June 17, 1958, gage height, 28.2 ft (8.60 m) , 

from floodmark, from rating curve extended above 2,600 ft 3 /s (73.6 m 3 /s) on basis of slope-area measurements of 18,600 

and 69,800 ft 3 /s (527 and 1,980 m 3 /s). 
HISTORIC. --Maximum stage since at least 1907, that of June 17, 1958. Flood in July 1932, reached a stage of about 26 ft 

(7.9 m), discharge 58,500 ft 3 /s (1,660 m 3 /s), from information by local resident. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 19 7£ 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 



DAY 



DISCHARGE 




82 


16. . 


70 


17. . 


62 


18. . 


56 


19.. 


53 


20. . 


48 


21.. 


46 


22.. 


42 


23.. 



40 
39 
37 
37 
35 
34 
34 
31 



24.., 
25.., 
26. ., 
27... 
28.., 
29... 
30. . , 
31.., 



32 

31 
31 
30 
28 
31 
35 
31 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND. 

MONTHLY TOTAL ACRE-FEET 

RUNOFF, IN INCHES 



170 
10,500 

2. 26 



■ • ■>■■'■> i 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1953 to July 1978- 



3,120 
11,900 



1,280 
4,440 



613 
2,350 



-120- 



NUECES RIVER BASIN 

(93) 08201500 SECO CREEK AT MILLER RANCH NEAR UTOPIA, TX 

LOCATION. --Lat 29°34'23", long 99°24'10", Medina County, Hydrologic Unit 12110107, on right bank 200 ft (61 m) upstream from county 
road crossing, 4.5 mi (7.2 km) downstream from Cascade Creek, and 7.9 mi (12.7 km) southeast of Utopia. 



DRAINAGE AREA. --43. 1 mi 2 (111.6 km 2 ). 

PERIOD OF RECORD. --May 1961 to August 1978. 

GAGE. — Water-stage recorder, crest-stage gages, and concrete control. 
Vertical Datum of 1929 (Magnolia Oil Co. bench mark). 

REMARKS. --No known diversion above station. 



Datum of gage is 1,265.8 ft (385.82 m) National Geodetic 



MAXIMA: FOR AUGUST 1978. --Discharge, 10,600 ft J /s (300 m 3 /s) Aug. 2, 1978, gage height, 8.40 ft (2.560 m). 

FOR PERIOD 1961 to July 1978. --Maximum discharge, 38,500 ft 3 /s (1,090 m 3 /s) July 15,1973, gage height, 14.4 ft (4.39 m) 
from floodmark, from rating curve extended above 910 ft 3 /s (25.8 m 3 /s) on basis of field estimate of flow over and 
around end of dam, 14,100 ft 3 /s (399 m 3 /s), and slope-area measurement of 52,600 ft 3 /s (1,490 m 3 /s). 
HISTORIC. --Maximum stage since at least 1901, 16.4 ft (5.00 m) June 17, 1958, from floodmarks, discharge 52,600 ft 3 /s 
(1,490 m 3 /s), by slope-area measurement of peak flow. 



MEAN DISCHARGE, IN CUBIC FEET PER SECOND, AUGUST 1978 

DAY DISCHARGE DAY DISCHARGE DAY 



DAY 



DISCHARGE 



DISCHARGE 



1... 


28 


8. 


2. .. 


1 ,070 


9. 


3... 


140 


10 


4. .. 


75 


11 


5. . . 


53 


12 


6. .. 


41 


13 


7. .. 


36 


14 
15 



32 


16 


26 


17 


24 


18 


22 


19 


20 


20 


18 


21 


17 


22 


16 


23 



14 
13 
13 
11 
11 
10 
9. 



24. 
25. 
26. 
27. 
28. 
29. 
30. 
31. 



MONTHLY MEAN DISCHARGE, IN CUBIC FEET PER SECOND. 

MONTHLY TOTAL ACRE-FEET 

RUNOFF, IN INCHES 



57.0 
3,500 

1.52 



I'r,'-' 'J 



Highest mean discharge, in cubic feet per second 

for the indicated number of consecutive days 

1 3 7 



August 1978 

1962 to July 1978- 



1 ,070 
3,200 



428 

1,510 



207 
816 



-121-